Thank you so much for your comment! n-n
Glad you had fun with the game and yes, the doors are a thing we need to fix after the jam ends, the original idea was the one you describe, a 3D 2Dplatformer but we ended up deciding some rooms would have a bit more interest to them if we unlocked that depth movement. But yes! We hope that when the game is fully released this issue will be fixed for a smoother exploration.