Woah, the production here is high-quality. The art, audio, animations, and puzzles are all really well-made! Really great work for just 4 days.
There are a few things that felt overly punishing and lessened my enjoyment. Restarting a level causing the whole level to restart, rather than just the room, was frustrating after working hard to get to a final room and then making a mistake at the last moment. I also thought it was difficult getting in position to actually hit some of the hourglasses. If I could reset individual rooms, or have three states for an hourglass (countdown, paused, rewind), then I would feel more motivated to solve all the puzzles.
That being said, what you made in 4 days is really great and feels like a demo to a full indie game. Would love to see an update with some of these pain points addressed!