This game is 5 hours long. Just putting that front and center.
Also, I really enjoyed the 5 hours I spent playing this.

The initial setup was a little annoying, as the game crashes if you don't have your monitor set to 720p when you first run it, but the community hub has plenty of answers and I got it running in 10-15 mins.
After that, never had a problem with the game. No bugs, no crashes.

A couple of the levels come off feeling a little cheap, in terms of difficulty, but most races aren't particularly long, so retrying a level a few times doesn't isn't as annoying as it is in some games.

The multiplayer isn't exactly thriving, but in the wake of this being on Humble, there should at least be a handful of players around. I didn't have to wait more than maybe 10 minutes to find a couple of people to play with, and that was with me playing races against bots while I waited, lol.

Wouldn't recommend this game at full price, because it's 5 hours long and... c'mon.
But if you pick this up on sale, for >=75% off, then it's a good game for a couple of hours.

Not particularly memorable, but definitely a good time all the same.

8/10
...I do have a soft spot for top-down racers though.