Great game, I really enjoyed it, I played through the mario world 3-4 times but I kept getting stuck behind the boss and gave up. But I have a lot of nitpicks:
- Spamming right click doesn't go into rewind mode every time, looks like there's a cooldown between when I exit it and I can enter it again. Not sure if this is intentional but it doesn't feel great. Sometimes this got in the way when I died, rewinded until I was alive, immediately died again and tried to rewind again.
- I feel like I'm spending more time than I should watching my guts being rewinded into place. When I'm dead I just want to go back to before I died, so I guess maybe rewinding could be faster after death.
- The jump doesn't feel too good to me, can't put my finger on it but it feels a bit delayed and the arc feels weird. The sliding and acceleration on the movement is also a bit much, it's not as annoying as it would be in a regular platformer since you can rewind all mistakes, and I got used to it in the end, but it still doesn't feel great.
- The idle animation is a bit too fast probably.
- Camera is jittery when sitting on top of a moving platform like the swing near the end of the 1st area.
- Having a big sign that says "save spot over here" in big letters seems to defeat the purpose of diegetic UI a bit.