Bugs:
When standing on a slope, there is a gap between the player and the ground.
Strengths:
The visual effects are well designed and give a creepy atmosphere. The wall-jumping mechanic is interesting, a lot of detail on the visuals used.
Weaknesses:
No sound, wall-jumping mechanic, while interesting, can be hard to understand (it only works if you are facing one direction) There isn't much of a story that explains why the character is there.
Change or Improvements:
Adding a story/narrative that might engage the player with the game, possibly changing the wall-jump mechanic to work in 2 directions(?) Possibly rotating the player or using a custom animation for when the character is on a slope to remove the empty space between the player and the ground.