Loved it, will definitely buy the full release.
The fight with the VIP dude was the highlight for me. His animations were clean and the beats were meaty. I also really liked the music for the frogs.
There were some parts where it felt like I needed to quickly double tap in one direction to avoid getting hit, and I think that would be pretty hard to do on controllers if you're thinking about releasing on console.
The last songs were quite intense but I never dropped below two health. Maybe for a harder mode you can nerf the health regeneration a bit or get rid of the checkpoints