Mediocre
Games like this have been done so many times over.
the graphics are bland, but they aren't bad.
The style is really bad.
The sound was bad, I liked the option to turn it off though.
I had no problem with controlling the shooter, but there was nothing else to do accept move in a circle and shoot.
There should be more then a single double-shot upgrade, and it should be a lot harder, meaning more enemies, and maybe some bosses. Bosses would be possible if the playing space was larger, and they attacked you back.