I like a challenge so I played this game for a while. I don't mind the sliding around as much as I thought I would. It added to the challenge. It just needs to be reduced a little. Especially the speed you build as you go. That was what really got me. I was almost more worth it to move forward a bit then stop in order to not build so much momentum. I think the other thing I'd want is more understand of where the check points are. A simple "progress saved" pop up message or a flag of some kind would be plenty. It felt like sometimes the check points where closer together than others. Which isn't bad but I couldn't guess because of the variation.
I say all that to then say.. keep working on this. Some fine tuning and I think it'd be a really fun game. You could add power ups to add some more challenge or to help get over some of the more difficult corners.