A very interesting game indeed.
The graphics are solid and consistent, and it definitely radiates charm with the portal-esque vibes.
The mechanic was fun to play around with, but the rewinding felt kinda jarring at times. Combine that with needing to reload the page to restart, and some wonky colliders, and it admittedly made the game (slightly) more cumbersome to get through than it probably should've been.
Other than that, no complaints. decent voice acting, good puzzles, great atmosphere!
Overall, good job!