I feel ya. ngl, it's surprisingly hard to describe this game without visuals. I faced that challenge when pitching the concept to the rest of the team, so I 100% get the confusion on your end!
The number keys are yet another victim of scope lol, since we were gonna use them for the shop. Items would spawn on the keys in-between waves (waves used to be much more distinct) and you could buy them using gold coins.
Appreciate the feedback!