It's Chao Garden turned into an actual game. So far, it's actually pretty good! Cute little critters and you can train their stats with random berries to win races or fights. Simple gameplay loop but an enjoyable one, I haven't run into any bugs or issues and it feels polished.
Maybe a lil bit like Fluff, but it's not gonna fully hit the member-berries. HOWEVER, there are still tons of fan servers of those said games still around and plays nicely with QoL updates to not make the game extremely grindy.
Nothing wrong with that. Just..... REALLY old graphics.