Just played the updated version. It feels more like a game now but it's a lot harder, almost impossible.
What I didn't personally like was:
- Enemy spawning randomly from the wagons and bringing an army towards me
- Sometimes 4 enemies would spawn at the same time
- Not being able to move - movement wouldn't make you feel so trapped (unless that was the idea)
- Only having 3 bullets at a time - could have 6 like a revolver
- Losing 3 lives quickly if you're surrounded - maybe add a few seconds of invincibility after being hit
- Bullet time not controlled by player - You could hold the mouse button down for bullet time, release to shoot
These are all suggestions. I think implementing even a few of them would improve your game