Ok.. I really like the game, I like that it requires a bit of thought and it looks nice. However, I really dislike the timer. Just in general principle as a puzzle platformer I don't care for a forced time limit. Especially trying to get used to the awkward control set a timer even feels worse. Now because you do have to control at least 2 slimes at a time rather frequently the control set kind of has to stay in one form or another. And though I get having some sense of urgency 30 seconds just doesn't do it the slimes (at least for me) move way too slow. An alternative option would be perhaps just switching to a high score table? Or just giving more time. Also regardless of what you do with the timer it shouldn't start until the player starts moving, it will give you a bit of time to plan what you are going to do.
All that said, again I do really like the game as a start. Pretty cool for your first game, but I think I would have more fun with it if you killed the timer or changed it somehow.
Keep up the good work, if your first game is any indication I'm sure we will see some awesome stuff from you.