I really enjoyed the story on this one and I think you have a solid base here but I had some general issues that need some polishing:
-While the grid movement, turning and verticality were great, I quickly got off grid and the player model often clipped through objects and the environment.
-I fell off the edge and fell forever. In my other attempts, I fell through the ground and got stuck walking around under the environment.
-Big open spaces that largely serve no purpose make traveling a slog
-The combat was pretty buggy, the enemies often were floating in the sky
-The combat could use more feedback
-Sound and music go a long way, even if it's basic public domain stuff just to add to the atmosphere
-Some seams on where wall meets floor need to be cinched up
Like I said, I think there's some potential here but it needs some work.