This feels quite fun, but you get stuck if you dont collect enough souls to make it trough the Gate? Not sure if bug or intentional, happened to me at second level
Oh mb, its the altars.... Maybe some highlighting of the altars / a UI popping up at the end of the level would help make it playable without a Tutorial :D Thaught its just a visual cue of making it trough the fight
Tried to do sth with the red button on the front of the gate for two minutes xD