This game is right up my alley, unfortunately I didn't understand how it works, even after reading the game's page and clearing the first level...even if I don't know how :/
It also doesn't work well on a 21/9 screen, but I sorted this out by creating a shortcut to the executable and adding " -screen-fullscreen 0" at the end of the target field. to put it in windowed mode.
The art style is great and the game seems to be fun though, congratulations :)