Wow that was awesome. Feels like a classic Sonic game on overdrive, what with the super fast speed, running on walls, and multiple paths. I loved the opening cutscene (the art in general) and... oh my that's some great movement. Just moving around feels so good, I'd love to play a longer game with these controls. Though like Kevin Mink said, walljumps felt a little awkward, likely because they were really short.
The first boss was kinda hard to hit in the second phase, which was fine for me but might be pretty annoying if you're trying to speedrun it like the game clearly wants you to.
I loved the final boss as well. Possibly the greatest challenge I have ever faced in gaming.
In short, 'twas hyper-slick.