This was absolutely fantastic! There was plenty of content without sacrificing polish. Impressive especially for a solo effort.
I like the combat mechanics here. Being unable to manually use your weapons almost makes fighting more about evasion than offense and defense. Controls work well although I had to refresh the page to get the focus working.
The glitch effects on the audio and visuals were used very tastefully and added to the theming without taking away from the gameplay for the most part. During the boss fight, I had trouble identifying what was decoration and what was an obstacle due to the changing textures, so I think some kind of consistent visual indicator would be useful there. The music and sound choices were solid.
My biggest critique, not a big one mind you, was that the computer character's dialogue felt too melodramatic for what it was. It felt like meeting someone and then immediately trying to help them through a mental breakdown without having gotten to know them first lmfao. I do appreciate what you were trying to do, but for my taste the story takes itself too seriously. Not a huge issue though given how well the rest of the game works.
Great work!