Really cool puzzle mechanic, I definitely was scratching my head for a while! The art style gave it a really unique vibe that complemented the gameplay well. Gameplay was smooth and using the artifact was satisfying both visally and mechanically.
I did encounter a visual bug when I ran the game on fullscreen, the artifact was still tiny and locked to the upper left corner, and I also got stuck where the level geometry was off a step in the upper mirror area. Overall very nice!