Protip: You only need to buy the spells with crystals ONCE. At first, I thought it would cost 3 crystals to cast but it turns out that it actually unlocks spells permanently.
Ideas for the game
-Make coins restore health by 1/2 heart.
-Add checkpoints so you can retry if you die. I hate starting over, completely wasting 15 minutes of my life.
Well, level 9 is the maximum level, as in the original Tetris. :)