This is a very good idea, and very nicely put together and presented, but I'd love if it was 50% slower.
It's just so much happening - I have to control the tricky vortex cannon, the elements move all the time, and they fire projectiles at me - some of which are going trough walls , so nowhere is safe. That's like 3 things to do at the same time at a pretty fast pace, which I think is too much. For my skill level, the difficulty curve not going up so fast would be far more enjoyable.
I love the idea of the elements, their execution with different attack patterns and very cool effects and sounds.
Solid entry!