Love this game. Perfectly fits the theme. Would be nice to have some sort of markings/symbols in addition to the colors since some of them are very close to each other, but more importantly it would help with colorblindness. Initially it seems like having more people show up as you play would make it easier to find the colors you need, but it's quite the opposite. Very well done difficulty scaling. My biggest gripe was the z-sorting seems to be opposite of the interaction layers. IE it always seems to pick up the person visually in the back, rather than the front.
Viewing post in FEED THE MACHINE jam comments
I've had a similar sorting issue before. My workaround was to collect all the clicked objects on interact, then loop through them, and return the object with the highest z-sort value. If the sorting is being done by hierarchy, it might be easiest to automatically assign an increasing value on spawn to reference for interacts.