Well I mean it's a version 0.01 so whatcha gonna expect. There are no shadows at all. Everything therefore looks flat.
The flow with the shifter kart at least is scuffed as you can't take a single corner with any kind of flow, some corners are straight up impossible without hitting the wall.
Most textures are also completely flat and make it seem like a gmod map, which is to be expected from this version so that's fine.
The mesh is kinda bumpy with weird transitions. I've also fallen through the map a few times. So while the idea behind the track is really nice (as there are no other indoor kart tracks for AC as far as I know) the execution is not too good. So basically as a fellow track builder, and that's not to **** on you or anything but rather meant as constructive feedback, I'd start again from scratch.
Once again, I am really not trying to trash you but it's better to receive honest and straight feedback than lying to you and then you realize after 20h of work that it's better to start from scratch than continuing this thing.