Good effort.

Not sure how to get more bullets, if possible. Controls are constrained to one axis at a time as well.

yeah there is a lot more that I can polish up. I ran out of time hada busy weekend in that crazy IRL place! I finished though it is a start!!

got to a little over a thousand score. I rationed my bullets pretty carefully, but eventually it becomes impossible to get more bullets. Perhaps you should make bullet spawns randomly appear after a while. While bullets should be an important resource, the more important one should be your hp. I often had lots of hp but no bullets. Even something like a very short-range melee attack where I could get more bullets if I needed when I desperate would've greatly added to this game. Background music was effective, sound effects were gratifying without being annoying. Gameplay was actually pretty engaging, if it only had more polish, like you say, would've been a pretty enjoyable entry. As it is, after playing two rounds, there's really no more enjoyment to be had.

Not bad, but not enough bullet pickups and the movement gets laggy after some time. Also some enemies wont move if too many are on the screen.