I like it! It has a reasonable amount of challenging sections, but the positioning of the checkpoints is pretty generous and you can usually just fine-tune your inputs to the difficult parts of a given section after you've had time to explore some possible ways through them. I don't usually play these kinds of rhythm-based platformers and I still got through the whole thing in under an hour without feeling bored or frustrated. The difficulty curve flattens out around the middle of the game so it gets easier as you continue to play it.
There's some pretty cool effects for the transitions, and while at certain points the visuals are hard to follow I usually had an easy time figuring out what to land on and what to avoid. There's enough visual variety to keep things interesting and pleasant without being too distracting.
Overall a fun, straightforward game. I figured I'd give it a shot after seeing the video but didn't realize I'd have this much fun with a game that has one input for 90% of its playtime. Thanks for putting it together!