Each individual mechanic has a lot of potential, but 'bullet hell' seems a very strange choice for most of these, not really working well with them. Perhaps if it started off slow and you gave people 10 levels to learn and master it, and it got gradually faster over time?
Great graphics, but I thikn it's too fast-paced for most of the mechanics to be worth using. With the enemies moving so fast, and the air dropping down, there's no time to care about potions or powerups or anything really - it's hard enough discovering "can I move to another crate or will it not allow me?" -- only way to find out is to keyboard hunt to remember the shift key while walking, then frantically press updownrightleftright trying to move while you're YOU DIED ... net effect: give up on crates, just run away from the wizards.