I quite liked this submission (especially since it's a fellow roguelike/lite, though the difference in polish and the amount of hours that went into your group's project is apparent), although it does take a second to get a handle on. At first I was thinking "where's the spinning?" before clocking that my attacks were literally slots in a slot machine. I think visually it could've benefitted from an animation (even as simple as the items in a reel teleporting up and down as its spawned in) could've helped to reinforce the link to the theme and make it more apparent. Also a fullscreen mode would be incredibly helpful given how much reading is involved (some of the fonts on the reel tooltips were hard to read).
Aside from that, a solid submission and definitely a game I would play in my free time!