Yo, wassup?
I just played the game for a few minutes, and here's some feedback I can instantly give you:
- The controls are too confusing. I'd recommend using the mouse to aim and shoot while WASD is used for movement;
- The tutorial isn't clear. I couldn't focus on the text while there was enemies coming, and I still don't know how to kill them;
- Although you say this is a prototype, I recommend you at least to use better placeholder sprites (like simple forms). You can also add more juicy feedback to the game, like screen shake and particles;
- I don't like the music. Honestly, it doesn't fit with the game, and it sounds like it's made by AI.
Your game idea looks fun, I wish you luck for the project.