Ground controls feel great, air controls feel terrible.
I would like to retain movement control while I'm in the air. Why not?
Feels like every time I go into the air a pre-rendered cutscene plays. I want to feel like it's one seamless physics experience.
Rail grinding look really good, I think I would like some form of interaction, maybe the ability to jump off?
I tried swerving into the green rail at the beginning, after the start but before it really left the ground, and I wasn't sure if the game would accept me onto the rail or not.
If rails are always going to be: "Collide exactly at the entrance hitbox" to start grinding, then that hitbox should have some visual indication. But maybe there might be a jump button, and you could freely jump onto a rail at any point.
I do not like all the invisible walls. Personally I prefer the freedom to fall off and die, or maybe do some insane speedrun skip.
Maybe for the tutorial you need the walls, but they should not be invisible, maybe just some semitransparent cyber barriers.
The camera is great in this.