Pretty nice game ^^. It's a very good concept, and I really enjoyed the checkpoint system! I also liked that a room could be done in multiple ways, that added a "puzzle" element to the game to find the safest route. The sound design is simple, but clean, with all the needed feedbacks, and the visuals are great.
However, I find it a little bit unnecessarily difficult with too strict hitboxes. Don't get me wrong, I like having a little bit of challenge and did finish the game, but sometimes, when I died and the screen paused, my character was absolutely not touching the element that presumably killed it :
The frontier between "hard" and "unfair" can sometimes be unclear with this game, which is too bad ^^'. But hey, I still enjoyed your game, it's a very nice entry, congratulations =)!