Played the game for a bit. I liked a lot of the explosion effects and guns, and I'm a sucker for coop games. However, I feel like the game should be a bit more flashy. Here's my suggestions:
- Increase the enemy density by 2 or 3 times.
- Make the player move a little faster.
- Increase the spread and bullet density of the guns, make them feel incredibly powerful and imbalanced.
- Reduce the player's hitbox size.
- Reduce the bullet speed on the drone enemies.
I think you have a good base to work with, but I definitely think you should kick the game up a few notches. No worries if these suggestions don't fit your game design though.