This is really cute.  It's like Cocoron meets Bubble Bobble. I tried more than a few times to see what combinations I could make. Good job. :)

Adorable and fun! Little shark got me pretty far.
However, it seems little shark can't jump too high. I ended up unable to progress due to a jump that was juuust out of reach.

I really enjoyed each pet having a special attack that gave them a unique playstyle. Of the pets I got to play as, I think Shroomy might have been the most interesting and surprising one. Although that run only lasted a couple rooms. I wish I would have had the skill to get the high ground and rain spore destruction on any who opposed me. Dealing with the frogs is kind of brutal. Especially when there are 2. So many bubbles to dodge. The basic attack felt a little bad, in the sense that you had to risk getting extremely close to an enemy, just to try and hit them. The game does seem to be rather generous with invincibility after getting hit though.

I had a fun time with the few runs I did. Keep up the good work.