The idea is fun, it's the best I've seen so far in regards to the theme. It's impressive how you managed to produce all the art necessary for it to work, and the result looks very good!
I just wish I had more agency as a player, even just a minigame to boost my turtle during the race would have been nice, at the moment it is as much of a game as a slot machine (which many people enjoy, it's just not for me).