Which would you eliminate?

[Flareon350]

I think pink balls are the least interesting monster. No surprises, and you can't reroute them (you can only block them). So I'd probably ditch them.

^^this

I think it would be really fun to see 2 other different types of obstacles in the game. 2 other door/key colors would be alright, but I would go for the Ice Block being an official tile as 1 of them and probably an extra type of button mechanic as another. Then of course there's the purple key/lock combo