Fun demo, difficulty's fine, echo everything GothicSimmer says.
I would add: the animations for changing rooms are a bit fiddly.
- When crouch-dropping into a room below, the head can register above the lower room's ceiling and put you back in the room where you started.
- When moving left or right into a room with a low ceiling, the character will sometimes be stuck in an airborne animation with its head rubbing against the ceiling until you slowly move the character (backwards) to an area with a higher ceiling.
Looking forward to more!