I liked the way that if you have fast reaction times you can stop the gambling machine at the right time to get exactly the powerup that you want and it's going just slow enough to do this adding some element of skill to the game.
I thought maybe the combat could be slightly more involved, maybe you could add blocking and have attacks deal less damage so the fight is a bit longer. Different types of attacks could deal deal different amounts of damage: slash, stab, headshot etc. I appreciate only a limited amount of work is realistically achievable in the short timeframe of a gamejam.
Overall this was a fun game to play. Nice work :)