I have a couple of suggestions: the red guy should probably be able only at the 2 small box areas, and make it so when you're squatting you can't sprint. And the light guy only spawns every 10 doors, so that you don't get too stressed, and maby make the rooms long in size. Okay that's all!
Dozer's bug:if moving while chrouching,its not killing you,but you should die even if you move when chrouched (but if its hard,you dont need to fix it.)
Elkman's bug:when you are hiding from it by wall,he still sees you.
To survive elkman,run back or hide in hole.