Thanks! I totally agree, the game need some polish, I think I will continue to work on it.
For the IA, it's my first game jam, and first (kind of) finished game, but I work as a developer (not game related), so code side, I have some training.
If you want, the code is available on github, the link is in the source part of the submission. When the game is run from the editor, you will have some debug info, but in short, it's just some symmetry based on the current velocity and the current target, a point of a path which is the circuit.
The code is just a little messy and not documented, since I rushed it for the jam, so if you look at it, good luck!