It looks like this might be your first game, so congrats on completing the game jam! Overall it's not bad for a first game. I think the movement feels smooth, and combat works alright.
In terms of visuals, I think the camera view is zoomed in a bit too much, and I'd also look into depth-sorting your entities. Also, I'm not sure if there's any audio or if just isn't working on my end, but that would be helpful to have.
In terms of your concept, I think it could be interesting if executed well, but it just seemed more confusing than anything since it felt like I was randomly teleported back for no reason. And I think there's a problem with the risk/reward of it since why would I want to risk dying or reset all the progress I made in the dungeon just for a bit of extra health? So maybe it could work if there's an extraction element where, in order to keep everything you gained in a dungeon, you have to kill a certain enemy/boss before time runs out, or something like that.
Overall, the game isn't too bad for a first game, especially since you completed in on a hard deadline. So congrats again on completing the jam!