So the game was odly satifying. The combination of numbers goes up, and frantically swiping the screen like Fruit Ninja worked with the vampire survivor type of progression.
If this were polished and built for mobile, I can see it being successful.
I feel like the game should pause while in the upgrade screen; that would have been great. I felt disincentivised to open up the upgrade screen, as I didn’t want to leave the slims unattended, even though there was no real drawback in doing so. More of a psychological thing than a practical thing.