I was stuck on one level for aaaaaaages, but then I had a stroke of genius and moved on. I’m on Floor 6 now, on the 3rd or 4th level there. Things are getting a bit tricky, because not only do you have to navigate the “get the hearts” phase, and the “get to the chest” phase, but sometimes you now have to look ahead to the “leave the level” bit – I’d inadvertently blocked myself in a couple of times.