I've played it for an hour or so and it seems pretty fun. The "Battle Rally" races are completely over the top arcade style. You basically run through different "courses" that are sections of Bailu. The map has been edited to include people cheering and a course made. You have to make it to checkpoints before time runs out like Hang On and Outrun whilst beating people up along the way.
Ren, Wei Zhen and Ryo all have different special moves which is cool. Here's some basic Ryo gameplay where I failed lol. I did get first later though:
You only start with one unlocked course - Rainbow Basin, I managed to get the high score after numerous tries and unlocked a new move for Ryo for the main game.
The Chobu Chan scavenger hunt is separated in to individual maps too, 20 Chobu Chans per different areas of Bailu. I managed to find all 20 in the first Village Square map area and won unlocks for more Battle Rally maps, Chobu Maps along with upgrades to my power and speed for the Battle Rally games - which is great because the next courses seem to get harder and harder as show here in some Ren gameplay:
Overall it's very arcadey and it appears to be some challenge progression as you unlock more races. You seem to unlock moves if you get first which will probably take a few tries. It's fun for sure but if you don't like hunting Chobu Chans and arcadey racing style games combined with Streets of Rage / Fighting Force then it may not be for you.