Great idea! I like the concept of climbing the walls a lot (also reminds me of the Alien levels in the Aliens vs Predator games). But it can also be very disorienting. Maybe it would be helpful if you have some indication where the the floor is supposed to be and maybe a button to refocus the camera to be parallel on the floor to help the player to reorient themself. Also adding subtitles would be great, as the voice can be hard to hear (especially for non-native speakers). I also think the tutorial level is harder than the first two levels.