I think you have a really solid foundation here for something really great! As others have mentioned, some sort of checkpoint system where you restart near where you died would be nice instead of having to redo the entire journey. I think redoing the journey felt more frustrating than it should have because it was a little tricky to aim the teleport down the tight hallways, sometimes it just wouldn't place it unless you lined it up just right. And then the hit box for the player might be a bit too big, where the player's head triggers traps it seems like. I think the mechanic is super unique and a really great idea though! If you just allow the player to get right back into the action sooner, and closer to where they died it would make it feel a lot less punishing. Really nice job on this and the idea! Excited to see future versions.