This game is brutal. Fun, of course. Appealing concept(no pun intended:)). I mean, it's DOOM banana edition. But it's also frustratingly difficult. I think you should be more leanient with the player, for example adding coyote time and making the hitbox's base wider to not make it feel so slippery. Also, when you're opening the door, every single bullet that hits you resets the timer; a little setback is fine, but not the full bar! For the rest, the platform design is actually quite inventive. I like it.