Very beautiful pixel-art, nice work (especially the menu)! The gameplay is functional, but I didn't noticed any difference between the enemies. They just came in my direction and that's it. Even the archers didn't shoot me or something.
If you wanna continue with this project, I highly recommend some good progression. Maybe coins after every wave, and a shop to buy new abilities or something like that.
Good luck on your project!
I would love if you could play my game and give me some feedback too! It's called "Touch of Madness":