Open source idle game, but not quite. It eventually expands beyond watching numbers go up, into a sort of roguelike, where you can wander the world and collect stuff. And die. Die a lot.
A Dark Room was where I first saw the @ symbol used to represent the player character.
Think enter the gungeon combined with superhot, but simplified a lot. It’s a turn based bullet hell, and an excellent arcade game playable in the browser.
EDIT: I’d also like to take this oppurtunity to talk about flashpoint. Flashpoint is a massive archive of basically every flash game and animation, and you can even play them again.
However, in addition to flash projects, I also noticed that flashpoint also archives HTML/HTML5 games… but only a subset of them. Although flashpoint’s primary purpose still is as a flash archive, it can also be used as a curated list of HTML5 games.