Banger. You could 100% build on this idea with more build variety and longer gameplay loops. The one piece of feedback I had would be that the combo scaling seems a bit weak to me, and maybe it made more sense for it to just be a flat multiplier? As an example, if I have 3 ROIs, it feels almost useless to get the plus 12 from playing a combo rather than getting some kind of other bonus. Fantastic game with beautiful art, music. and theming though. One of the best so far!