I shared an early version of this a few weeks ago, but I've made a lot of improvements and I think I'm done with it for now. It probably has bugs, so please let me know if you run into them. I present to you: Doomscroll, the game you play just by scrolling! https://gisnep.com/doomscroll/
DOOMscroll

Scroll to survive. How far can you DOOMscroll?

@ironicsans I'm very much enjoying this, thanks. I think I crashed it by dying at the same time that I reached a weapon upgrade - froze up completely and needed to reload.
@theplaguedoc Oh weird. I'm not sure I'll be able to replicate the bug, but I'll see if I can fix it!