Finished it in 833.75 :)
I liked it overall, got just 4 small bits of critique:
1) I'm a bit confused by the level with double jump, followed by allowing the player to double jump later on - that felt inconsistent. From what I gathered killing a skeleton gives you a double jump?
2) I found a funny bug - when dying on fire sometimes the death animation plays multiple times.
3) the death zone at the end of the level past the door felt very punishing for no reason.
4) the text disappeared too quickly for me, maybe making it disappear after the player has moved would be better.