The Pit of Souls

Souls-like but what mechanic are we missing? Controls: hold up for going through doors. 'a' and 'd' for move, dash from left ctrl. Space for jump and revive.

edit:
the game in this state has a lot of bugs so if you want to try a version that is playable try this:
https://avanto.itch.io/the-pit-of-souls-fixed