Fun game! It uses water in all three states; liquid, solid, and gas!
I enjoyed it once I understood:
- Aim using your mouse in the bottom left corner
- The water tank and ray gun have cooldowns
The game is actually really cool - shooting water, freezing it, and evaporating it to fly - some really nice ideas!
Aside from the two points above, I would make the hover activate on a second press, rather than holding jump. It would feel a lot more responsive.
Great music, too!
Well done!