Wave 7 is a tough one! The game is really fun. I like the concept, it's destabilizing but not unmanagable. :D Even if I had troubles shooting a lot of ennemies with a single shot (if the movement is too fast, nobody is touched), it felt really great to use. And the difficulty is also very well balanced.
Good work on the visuals too! It's simple, but with a nice touch of polishing and good feed-backs, as well of course as lots of beautiful effects! This is a really cool entry!
(btw, I would have expected the game to be compatible with azerty... That's my only complain! :p)