Blob for the win ! ;)
I like the idea, and the progression of levels is good! I also like the fact that each color of food gives different attributes !
As someone said bellow, I would also have preferred the attack to be continuous instead of having to bump in and out.
Also I would have see the blob been able to eat everything small than him and growing a bit faster. Like in Agario for example ^^
But cool game. Except I wanted to eat earth and moon but couldn't! :(