Hey! Thanks for sharing!
That was a lot of fun!
I don't know what feedback could be useful hehe, just letting you know that I really enjoyed your game, I beat it in my 5th attempt aprox.
Changing colors sounds nice, and an idea for obstacles could be something that pulls you towards it (not strong enough that you can't get away from it, but it takes time / can make for interesting situations involving dodging other obstacles), or maybe currents.