I absolutely agree with Donny, using only the wasd keys for movement with the space for shooting is awful. give the option of being able to use the arrow keys for movement as well as wasd for the best user experience. some people, myself included in this, hate using wasd for movement and would much, much rather use the arrow keys.
other than this huge fact, it's a decent game for what little I ended up playing on it. I just can;t get past using wasd to move, sorry.