Very interesting and unique game, reminds me of Dark Souls if it released in the 1990s! I quite liked the ultra-pixelated 3D and the music, although the song playing in the first area was a bit repetitive.
Some parts of the level felt a bit like a bunch of random platforms thrown together, but I liked the sense of scale and the feeling of being a tiny person (robot) in a giant dungeon. Many areas could be skipped simply by dropping down the giant pits - perhaps there had been an intention to add fall damage at some point?
The controls were a bit floaty but workable for the most part. Oddly, it seemed like attacking and dashing only worked immediately after jumping (not sure if intentional or not). In a true Dark Souls fashion, I ended up running past everything except the boss, and managed to reach the end screen despite only finding one part of the medallion.
All in all, a somewhat scuffed demo, but perhaps that's part of its charm! Good luck with future updates!