Nice game. I really liked the feel and the movement and the music which fitted the game very well. Here is some feedback which might improve the game:
- I do not know what the "power" button on the title screen does. Nothing happens when you click on it.
- In the weapon/level select screen I would also allow mouse inputs. As it is anyway a game where you use both, you should also be able to click the buttons with the mouse.
- Not sure, but I had the feeling that the art style was not consistent. I think some assets use different pixel sizes.
Still this is a good entry and I had fun playing it. Congrats!