First of all I quite like the artstyle, its simple, but works pretty well in my opinion.
The noise after going through each wheel segment is very satisfying, but i think there could be some more stuff to do with sounds .
The core game loop is in my opinion just unfair. And I'm trying to not say this in a way like I'm salty about not winning (I did not, after about five long attempts)I think the core mechanic being luck is not very good design when not complimented by a mechanic that the player can somehow affect. Also that being paired with punishing the player for taking too long to win (by increasing the spin cost) makes the game too difficult while not giving the player many chances. (in my opinion, one possible "solution" could be removing the cost entirely, or just not make it increase)
That being said, i think you put the game together quite nicely. I will be waiting for more games! :D