Good job, i really enjoied. The game're creative and funny. But, personally, i think some things can be better.
The square is OP. It can to last fewer or have a cooldown.
The shapes are sometimes useless, especially the diamond. An use can be than, some enemies you have to draw a shape to defect them.
The Boss is easy, it's problematic for me, cause, he supposse to be the "boss" but is'nt more difficult than penultimate level. If he can shoot you to sides and force you to use your shapes, can do his battle more interesting and difficult.
Finally, i hope to see more of your projects in the future. ;D