for whatever reason the graphics are INCREDIBLY jittery. like going up and down constantly, it's hard to look at.
i genuinely find the arrow keys to accelerate to be counterintuitive, i seem to recall of having the same complaint with planet rally. for keyboard only games, i would expect the arrow keys to handle steering, and then the various actions to be set on zxc etc
the sound effect when you reach full speed is essentially unbearable and it never stops.
i really like the quick boosts, you captured how ctr does them very well