Just finished the demo there is a lot to like and yet i feel like there is a long way to go.
The controls feel really nice and responsive. I loved the grapics, when i saw the big screenshot on the main page i knew i had to try it. I does still fell a bit unfinished, but as far as i can understand its still in development. And might just be a smaller scale project. But the fact you wrote the engine yourself in C++ is really impressive.
I do notice that falling off the track makes it borderline impossible to get back on it. Fell down into the river at the very end of my first attempt. Some ways of helping the player back on the track is really needed, maybe like the unflip but for returning to the previous checkpoint for a large time penalty. The track doesn't really beat you over the head with its linearity, but if you take a wrong path you eventually just end up in some random geometry. Maybe make it so that following a path that isn't correct enelops you in fog as you get further from the main track as a cheap way of avoding mapping out all the surroudings. Or simply map out all the roads so they eventually end somewhere that looks natural.
The enviroment design really does lack a lot of visual variety at times. I really enjoy the artstyle overall but yeah, a lot of your surroundings are just the same thing over and over again. There isn't really any visual landmarks for people to remember parts of the track by besides the layout itself. Something small like a couple sharp turn signs, maybe some of those separate stone dividors you can find along alpine roads or some small shrubbery besides trees. Thats just a suggestion though, but the lack visual visual variation might leave this looking a bit forgettable.
There also obviously isn't any music. I just imagine some very inintrusive Jungle music, given the era these games are from. But anything even ambience would really go a long way. But i know this is still in development, its your choice what direction you want to take this after all.
Looks really cool though, think this could turn out really cool 👍