Solo gameplay changes

The game´s pretty fun and balanced in coop (as intended) but in solo i cant get past the 1st level (idk the correct terminology), in my opinion, there should be either AI teammates of balancing for singleplayer, like making the player take less damage or make them make more damage, or lowering the amount of enemies.

Literally anything like this would make the game 100% times more fun in singleplayer