Love this. I recently acquired a Commodore 64 and wanted to make a simple game for it as well.
There's definitely something to be said about creating new games for old systems. I actually went to a game store by my house the other day and they had an entire section of SNES homebrew with boxes and carts.
Lots of little fun stuff on micro controllers and mini computers.
The most fun was doing one for the 2600, VCS. 128 bytes of RAM, 6502 at a little over 1Mhz, 4K ROM.
https://pdroms.de/wp-content/uploads/2007/03/20110402_ooze!....
Site is down, but there is a screenshot. Someone wanted to distribute it as a homebrew cart for collectors. I agreed and asked for a cart and have not cared what else happened.
I wanted my own cart as a kid, got one and the collectors have something to collect. Win win.
Wrote it in Batari Basic. Amazingly, that is a compiled BASIC for the VCS and now other Atari systems. Was fast, fun, lean, mean.
Was for a minigame compo. Those are a lot of fun too. Everyone writes something, gets feedback, there is voting.
This one is simple. The ooze comes down, you have to keep it at bay with your laser. There are levels where the game dynamics change for a different strategy to get through.
I learned something on this lark, and that is where the available options are limited, one can focus on the game, have some fun.
There is nothing special in the game design sense. But it was a lot of fun to make that old, limited system do something.