The game is cute, I would say that it has a defined vibe to it (it looks and sound all quirky and mysterious)!
I enjoyed how enemies use some sort of physics, so that faster ones are harder to repel, and so does the main "attack": driving them away reduces their velocity, so that you first have to slow them down, and then repel them. Well done!
If I may give one piece of advice, I would balance the "fire stone" power up: since I placed it at the far right of the screen, I had an easy time repelling incoming monsters, which got me to level 4 pretty fast!
Nice job making that the shield also destroys gems, as it offers a punishment for overusing it.
Other than that, good entry, thanks for making it!