Here's what I think:
I like the use of the rewind to established a narrative and mood instead of using it as a gameplay mechanic. The exploration feels dangerous and exciting, a bit disorienting at first but you get to familiarize with layout soon enough. I think it isn't that much difficult honestly, not at all harsh and unforgiving giving you an extra energy slot and plenty of extra lives if you're willing to explore enough, which I was.
It's a shame the audio seems to cut out a bit at random at times cause I liked the mood, maybe next time just a little ambience would be nice but I love that you went the extra mile to voice act the thing.
If you're interested in a puzzle-platformer check out my game and let me know what you think!