Love the idea of being a service bot, of course. I'm guessing any mechanics relating to the modules besides just getting them (and them affecting your sprite) are unimplemented, but i can see the beginnings there for being able to upgrade or expand them, or to have a spare when they break like the page says. For me, my rhythm game brain took over and i instinctually did what was intended when the circle popped up, but yeah, you already know that should probably be conveyed ahead of time somehow or other.
I think this game is cute and if you do expand upon it more later i'll certainly be in favor of it!