Looks like a custom-built game library they designed atop Pixijs https://abagames.github.io/joys-of-small-game-development-en/tools/for_browser.html https://ab

Looks like a custom-built game library they designed atop Pixijs https://abagames.github.io/joys-of-small-game-development-en/tools/for_browser.html https://abagames.github.io/joys-of-small-game-development-en... [edit] It seems that Pixi is one rendering method, and the graphics themselves are abstracted via a "terminal" and "view" class, so the engine focuses on positioning art rather than handling sprite draws directly. It's a nice set of opinionated choices. In particular, implementing collisions for 2D sprites. I built a game engine like that with particles and collisions (and particle collisions!) in AS3 on top of Starling at one point... sadly, I can't make games with it anymore.