Nice idea. Just needs some hazards, increasing in speed over time, visible score, and maybe some more power ups. Right now you can just put something on the S key and walk away from the computer.

I played this for too long. Very nice music.

Will it have a Sonic cameo?

pretty fun! just need more stuff to do and will become a solid game (add ring count, lives?, timer, obstacles, etc)

and indeed the cat sound at the end was pretty sad, try  a screech next time to avoid killing the happy mood of the game

Not really a lot to go on. Music's good. The only thing I'll mention is that I feel bad hearing the cat's howl on the Game Over.

I had fun with it. I'm sure you're still thinking of obstacles to add. I think a game like this is suited to be like Robot Unicorn, etc where the game never ends but you try to beat a high score. I liked the rainbow ring too, lots of fun.

The dynamic background animations are neat!  Especially the transition to the star mode.

Looking forward to see what else you add to flesh out the game, if you decide to.

It looks nice. I like the varying scrolling speed based on my relative position. I'm sure you can figure something out about the gameplay going forward.

In browser version there was an almost second long freeze right before the first rainbow hoop appears, could be some loading.

Nice work on the visual elements that are there. Having the option for a singular jump at the very start comes across as absolutely hilarious, love it, keep that in there for sure.

I do wish I could use spacebar to increase downward speed once airborne.

Doesn't keep score which is weird since this is a score based game. Everything else is great, but it's weird it cannot do that when it's simple to do and the rainbow rings exist that do a lot more with changing the background.