If anyone is interested in how a tiny game can be developed on a really small shitty, cheap and low-performance) chip, here's a nice video from Bean Heck:
https://www.youtube.com/watch?v=PZsWqOuJFKI (part 1)
https://www.youtube.com/watch?v=aq30EdgSpOY (part 2, result at ~1:18:00)