If you like roguelikes, give a try to our game :D. It's a 8-bit rogue-like were all the values are scaled with the same value, so all depends on that, your life, attack, speed and money. But also the stats of your enemies hahaha.
Here is the link :https://itch.io/jam/gmtk-2019/rate/461305
PS: Your idea looks really cool!. I will give it a try soon hahahaha, the use of only one bullet with that twist it's really interesting. Good Luck !