Cool game! I love the idea, I enjoy science simulation games like this :D I do have some constructive criticism though!
The way the tutorial boxes are constantly pulsing makes it incredibly hard for me to focus on and read, I had to try reread them like 3-4 times >.< I'd say the only things that should pulse would be the arrows!
I quite liked the menu music, but not so much the very short nature noise loop for the actual game, and had to mute it quite quickly. I appreciate the idea behind it but it's just too intense and short of a loop. I'd honestly say to make that menu music the music for the game instead! It's nice and relaxing and fits the vibe.
The quest system isn't very clear about when a quest is complete. It seems inconsistent too. For example, it asked for a Whirligig Beetle Larva, so I caught and sent one with 12 minutes left, and nothing happened for a fair bit. Suddenly the screen sorta flashed a couple of times, I check the quest again and the money symbol is highlighted in green, the timer has gone down to like 50 seconds and the checkbox is scribbled in. So I tested it again. It asked for a Caddisfly, I sent one, and sat watching the 30 seconds tick down with no change to the quest bar, nothing to indicate I'd completed it (I closed and reopened the notebook a few times with no change). When it hit 0 I got the money though! (Btw I've found quitting to menu and resuming makes it mark the quest as complete)
So it is pretty confusing and hard to tell when the quest is complete. Sometimes it doesn't indicate anything, and when it does it's not clear what it means (the first time I saw the box scribbled in black I thought that meant I'd failed the quest! Might be better to swap it for a small box with a checkmark). I'd say for the timer to be set to, say, 5 seconds upon completing the task? With the box checked and the whole thing highlighted in green.
Additionally, it takes a several clicks to get between the tables, I'd prefer for each table to be linked in the notepad like the other locations, there's space under the current links! (Unless that space is being saved for other links that is)
So far I'm not really sure what the point of testing on nor keeping & feeding the little guys is, I seem to just be catching and immediately sending the critters, but perhaps I just haven't progressed far enough yet!
A little bug I noticed was I had a dead flatworm (oops) and packaged it. On the package info it said the status was "perfectly healthy" despite being..uh...dead. Lol. Another bug(?) is the chemicals sometimes not responding to clicks in the shop, and attempts to drag in the testing screen.
Make no mistake though, I do like this game! I don't mean for this to come off as intense criticism, I just think this game has potential to be a pretty neat little simulator with some kinks ironed out!