The concept of the game is pretty good. Just some things I would like to point out:
1. There has to be some sort of tutorial or at least an instruction for the player to know what controls to use as well as get used to the controls before going into the game.
2. This might just be me but initially I kept my mouse close to my character which resulted in me not being able to shoot the enemies at long range. Eventually, I just realized that the placement of the cursor matters and that's when I was able to finish the game. (This sort of relates back to #1 since there wasn't anything to tell the player)
3. The sound effects were kind of shocking. I didn't expect them to be that loud so I recommend at least telling the player to lower their audio or something like that. But they weren't bad.
4. I don't understand how the enemies became the weapons.