First of. WOW. I can see a lot of work has been going into this and there is a lot of focus given to the fine tuning of the steering mechanics. I haven't played Wipeout in many years and so my feedback as a player can be considered entry level, or newcomer.
My feedback below is not an indication of things that are wrong or missing. I'm just going to offer humble ideas on how I think it can be improved.
First just a quick UI challenge.... 1024 X 768 fullscreen causes a "warping" of the game UI which is naturally at the user's request. This warping appears to throw the UI out of alignment whereby having the mouse in the center of the screen, allow me to click on the NEXT button on the far right. I don't know if this is something you might like to test on your side - After that I played in windowed mode and the game was running fine.
Frame rate Performance hit
I have a somewhat outdated Laptop(I'll attach my specs) so the frame rate was suffering at "Fantastic"
I had to scale the quality down for a smoother gameplay. This had me wonder if perhaps there is a performance drain somewhere since I don't think that the pre-race scene I was looking at had that many elements to cause such a performance hit. Perhaps the performance hit is irrelevant on stronger machines... but it might become a problem if the game starts using heavier assets.
Track Alpha and Track Gamma have too much visual noise. The feedback below pertains to those two tracks alone since the Beta track seems to have a different visual layout. The thing I noticed was that it looks like you were aware of this and tried to make the green arrow (visual queues) pop in the daylight by making them bigger... but this approach just added even more visual competition between the track elements.
So by visual noise I refer to the vividness and brightness of elements and how they tend to catch our eyes.
In the game, the grass billboards are very front and center, and very bright. Things like trees, bushes and tall grass are actually quite dark, even in the day time, because we can't see the top surface where theses items are being lit... they are also quite distant and blurred into the background (no jagged edges)
Overall your daytime tracks are applying a LOT of ambient light to everything which is very colorful and distracting. The yellow "turn" boards become almost camouflaged as a result.
I would recommend that the surrounding scenery be dulled down with colder darker colors and a less ambient light. I would avoid using the grass billboards altogether or at least make them smaller and darker.
The constant gritty texturing of the ground (dirt) was also adding a lot of visual noise. I feel that racing games (especially street racers) get by with making the pattern very subtle , somewhat darker (or less ambient) and mundane so that the player forgets to look at it. With that you won't be required to try and boost the green road arrows as they were really working well they way they are in Beta.
I believe the changes above all relate to reducing the texture noise, brightness, quantity and ambience of "background" and doing so would reduce the visual noise and make the game play feel cleaner and more crisp.
I would have liked it if the camera was a bit higher... when it gets too low to the ground, the track flattens to a point where the sides are just horizontal blurs running straight across the screen. in Other words it reduces the visual impact of a curve up ahead...
Lifting the camera to be more above the player will allow them to see and understand what is coming a bit better. This might seem like a generous change that will make the game easier, but I think it is necessary because we don't have natural depth perception or natural motion blur in games that would normally help us define the road up ahead... so a bit of camera elevation might help compensate for that.
Keyboard controls weren't bad. I'd have to get used to the sensitivity but I understand that this is a core aspect of the game. I kind of feel like it is snapping very fast between straight and full turn. On the other hand a gradual build might annoy players that want to get full turn right away. I'd like to suggest that you consider trying an exponential increase in value (so not linear or instant but something that curves so that there's an option to feather the turning with taps, but reaching full turn shouldn't have too much of a delay)... but that could just be my noob expectations. I was a bit disappointed that I couldn't use the mouse and was hoping there'd be some kind of analogue steering option. Does the game have controller support perhaps?
This is more of a personal preference really. When hitting the edge without blowing up, it still seems to have a tremendous penalty. I know that it should be avoided at all costs and wouldn't happen very often if I get more practice in, but I would dim the penalty down a bit anyway so that I don't have to stop almost dead, re-orient and start accelerating from scratch again. While this isn't realistically accurate, I think it will keep the excitement and flow going.