I actually really enjoyed the game. I might have played it for a little longer than intended. In the beginning I really did feel like a turtle racing, not so much due to my speed but because of the controls which made me try to be careful and therefore naturally slow down. I very much like that. I also really like that you can practice and upgrade before challenging the rabbit-rolla.
I only found it a bit strange that you can basically just run through entire track and collect all the coins without even starting the race. Ig, it's okay if you can simply investigate the track, but in that case maybe it makes sense to disable the coins if player is not racing. That would also give me an incentive to actually try and collect all the coins during the racing while also trying to keep up the pace.
All in all, a very enjoyable entry. Great job!