This is hard, because the game it's too short to give a more detalied opinion.
There is the idea, very similar to the old "Bounce" game, with the grown mechanic. The gameplay was intiutive, but I found some elements misplaced. I mean, you didn't need them to end it, half of them could have worked in the same way. I also didn't feel a progression between the three "rooms", but this is a problem only if I take this as a finished game. As "first level" it works ok.
I could also say that I felt a random choice for the assets, but I think everything was thought to be funcional and short, in order to complete the Jem with a completed game.