The crash physics are decent. The gravity physics are whack. You can ride a diagonal wall and gravity won't try to pull you down.
The unskippable ads are annoying. If you finish a race and retry, you are forced to watch a 30-second ad. What's unusual and especially bad about this is that THE RACE GOES ON WITHOUT YOU! So then you have to pause and retry again. Luckily, there is not another ad when you choose that. But it's unreasonable to be forced to watch a 30-second unskippable ad for no benefit when normally it grants any of three benefits you can choose before racing.
That's right; if you want to beat out the slow AI opponents that crash into everything for you, watching an ad can grant you considerable advantages. Bad game design. I should either pay with in-game earned currency, or advantages should be randomized for each race.
This game legitimately only shows 30-second unskippable ads. I deleted it during the fourth one.