It is a game made in Gamemaker: Studio by a programmer as good as the game itself (me).
Please bear in mind that power-ups and waves are generated randomly, so every play will be different!
Controls:
W - up
A - left
S - down
D - right
Space - shoot

Happy playing!

You are free to use any content (graphics, sound) of this game. You can, but not need to, give credit.
Sounds made using Chiptone by SFBgames.
http://sfbgames.com/chiptone/

If you really think that this game is worth anything, and want to support me, here is my donation address:
bFFxTYNxjRroVzL9tD7hRGUY2d3njogvVT