This game is so fun and original. I think some tutorial all yellow enemies would be great, I think traps should be introduced same time as the slickness, maybe some enemies that you can't hit, but have a charge attack that causes them to slip into traps that can damage them. One complaint is maybe allow for more than 1 floor to be slick, and also if an enemy spawns on a slick floor they can't move so its pretty easy to cheese.