I made a 1 bit memory chip :O (has 2 addresses 1/0 which can each store 1 bit, and then a 3rd input is for switching between writing [0] and reading [1])
very cool game/app!
the first chunk of my chip is the part that handles the addressing, it sends the write signal (if on) to the currently selected memory section, I actually made an 8 bit memory chip with 8 memory addresses in Logisim and I'd recommend that if you want to do larger or more complex projects (although you can still totally do it in this)