I thought this was a really neat idea! I liked the different mechanics for moving upwards that you picked up for each section (particularly the stilts) and it lead to a fun experience :)
It was quite different to other 3D platformers and I thought it worked well. Hzaving the light under the player to indicate the position was a great way to ease any difficulty with depth of field and added to the eerie feel of the design. Level design was also really good.
All in all - nice one!