This is so polished! Great art style and audio, really good atmosphere right off the bat. In a potential future update, some voice acting (like reading the letter) would add to it even more. I thought the gravity felt a bit too hard, i.e. jumping and falling could feel a little smoother. The time switch mechanic is unique and adds a cool puzzle element to the genre. However, my one gripe was the insta-death -- like lightly running into spikes from the side, or touching a rat. I'd strongly prefer a health bar so it's not as unforgiving.