Keep workin'!
That game has lots of potential, from what I can see. If it's a work in progress, then keep going! Obviously, more levels and stuff like that, a health meter, things of that sort would help. Just the basics of the game. Also, you might want to add a jump and/or crouch movement, especially if your opponents are going to be shooting at you eventually. Keep working on it! I'll be looking forward to it.