As far as I can see the game looks like. Roulette was a good addition to the game, I personally really liked it.
The price of the upgrades doesn't seem to be that expensive if you use the roulette wisely, however, it would be nice to be able to buy them after 3 to 10 shifts.
Of the few minutes I played, I was only able to make good use of the roulette wheel a few times. So, another point for the roulette