I think you have so much room to expand what you have created so far. The turtle world you have created look great. I love the feedback sound affect when something is ready to go however, I don't feel compelled to explore as the first upgrade you are prompted with take 5 mins of just straight clicking to get or 5 mins of running between cloud dumps to get a pair of wings. Maybe adding in collection cap, so you can collect up to 20 or so of each item with room to upgrade that cap. This way you have about 100 seconds to roam around before you feel the need to come back. I know this sound like overkill, but I would greatly reduce the time lock on anything you put in for the first 15 or so mins of game play so that players get a feel for the game and get invested before you time lock things.

I first three times I played I spawned in the water under the turtle so I had no idea I was at the home base.  I saw all of the stuff ahead of me and took off. I'm not sure if you are going for a make your own fun kind of vibe or knowledge based mechanic or not, but this could stand to have a bit of a tutorial as I immediately took off in the other direction to the other island without any knowledge of my space. I'm not sure if this my screen's resolution issues or not but the buttons at the bottom are barely noticeable since they are half cut off for me. I click on the first one and realize it takes you home, but because I had never been home in my mind so my thought was "how would I have ever found this on my own".

 I also think making the world have more diegetic UI will make it play more smoothly.  For example, instead of the popup UI for the rainbow/cloud collection just clicking the rainbow or hitting a button near the rainbow or once you get into a certain proximity will pick it up.  This will at least speed up the collection so you don't have to go from wasd/arrrow to move mouse back to wasd/arrows. If there was more of a choice than pack this up or don't I would say the switch to the mouse is fine, but I'm doing arrows with my right hand and mouse with my right hand so there's a lot of back and forth for me.

The game feels really whole. I like the player controls.

It's a very fun idle game. I could easily see myself having it open while I do other stuff on the computer and check back in on my turtle every once in awhile. It looks like you've got this comment a bit, but I think the cost to start needs to be decreased a bit. You have to spend a good chunk of time just walking over plots of land and pressing E until you get enough rainbows. 

The art and music are great and convey chill turtle and fairy vibes! Nice job! 

I know I've said this before, but I really like the graphics and the sound, as well as the general theming & world-concept! I think the part of playing I've enjoyed the most actually is visiting the other NPC fairies' turtles and hiking around there, partly because the little forest is a pleasant space to wander, and partly because it's fun to try out different loops through all the cleanup spots. And the framing of "helping" the fairies that way feels nice too. It's super chill and cheerful!

I also agree with what others have said: setting up the initial collection of 4 of buildings feels a little rough--it feels like I'm waiting to get started, and when I see the cost go up for each consecutive grass plot my brain sadly translates that into extra waiting.  Once the initial cluster is set up there's kind of a fun whack-a-mole pattern that emerges with gathering the output, it just takes a little while to get there. Leaning more clicker-style with clicking-to-speed-things-up might help with the intro, as much as tweaking the initial costs. It might also be neat if a tutorial NPC gave the player "free vouchers" (or maybe just loaned out rainbows) for each initial building in series, so after you add a building you can go back for the next voucher (or rainbows) until you've built the full set. (Afterwards, maybe you could optionally pay this helpful NPC back and get a little cosmetic bonus as a surprise thank you.) I know dev-wise that might be a bit of a stretch though!

The other comment on allowing a bit of accumulation per generator would also be nice. Without any accumulation (and until there's auto-collection), it feels like my role is to be a very important cog in the machine at all times, and if I take a break then everything will grind to a halt. Allowing a bit of leeway there would make it easier to be social or explore during the early part of playing (before you can afford the tier of generators that auto-collect). Maybe the level-1 generators let you have one collection waiting and only halt production after two are waiting, and level-2 lets you have up to three waiting. Or maybe the production rate could slow down as more collections are waiting (0 = 100% generator speed, 1 = 75% generator speed, etc) and the slowdown effect reduces with each upgrade. Just a thought!

A couple more wishes/ideas:

- Scheduled downtime ("break time," "fairy holidays," day/night cycles, etc) could be a fun & chill route to explore, just to encourage exploration, being social, or just taking a break yourself.

- Foraging loose objects (finding colors floating by / landing on your turtle) could be a fun little distraction that also helps the world feel more alive.

- It'd be fun if wings could let you fly around a little!

A couple more things I enjoyed:

- Changing the cosmetics to be mushrooms and flowers and caterpillars, to make a little wilderness garden.

- The wing varieties, especially the moth-like wings option!

On the whole this is a very nice casual jam game and it feels like there are a lot of directions you could take it. (Also it makes me want to make a game about small creatures around a puddle outside.)

Good job!

A casual idle game. My only concern is that the initial mixer-buying is pretty expensive. Having to buy 4 buildings while eeking out 1 rainboy every few seconds kinda sucks.

Besides that, I like it quite a lot! I could see it being a hit, especially with the multiplayer content.

Very casual game. I love the art and aesthetic which I'm assuming was the focus here. The multiplayer aspect is also very cool. I need to make an account to really get a full play experience.

Some things I'd want are some way to increase my currencies without strictly waiting for timers. It feels like a clicker game so I'd like a way to "click".

I also think having different ways to interact with other players bases would be neat. It started to get old pretty quickly just running around clicking the same button on every plot.

I did run into a bug. I softlocked the game by teleporting home. I wasn't able to move afterward.

Some quality of life improvements I'd suggest are having the initial plant be a production of some sort. Even if it's just moonbeams or a color mixer currency or even like a quarter of a rainbow would be good I think. Either that, or just skip straight to one of the color producers or mixers.
Also, I think production should be able to accumulate. Waiting for a single rainbow for five seconds at a time is rough. The time is short so I felt like i should just wait there. I wanted to explore but then my base would become innefficient.

The aesthetic is wonderful, love the low poly graphics and everything. And again the multiplayer aspect is super impressive.
Great job :)