Amazing job! Everything feels so polished and the new mechanics really add to the experience. Although the game is hard, it's not unfair and I feel like a big part of the fun is learning how to complete a room through trial and error.
My only feedback is that the checkpoints need to be a bit more obvious (either have the lanterns light up, or a little sound effect play), and maybe some of the new mechanics need a slightly better introduction. Other than that I think this is an awesome entry and I can see it being a very popular platformer once it's fully released.