Mechanically it is pretty dull. It looks like those games from the 80s where it looks a bit simple but scales up to be one of the hardest games you have ever played, however, in your case you are missing basically everything. A simple health bar would be sufficient so at least I can try to beat the game without getting hit once.
Btw, make your enemy colliders trigger or to not be affected by physics on X/Y/Z because currently I can just push the enemies which looks really weird. Also, power ups would be nice, which would change the bullet and shooting style (like Aphelios in league of legends?). And lastly, the player collider for picking up things is too large, I can pick things that are half screen away from me.
Anyways, don't get discourage and my advise would be to keep it as simple but to focus on a full prototype game (even if it has some bugs).