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Dead Cells and a number of other high-quality commercial games are using Heaps: https://heaps.io/

The Haxe website has links to some other popular frameworks like OpenFL and HaxeFlixel: https://haxe.org/use-cases/games/

Thanks for bringing heaps and the others to my attention.

I look at this list and suddenly 4 of the top 10 game engines I'd consider for a personal project are from the Haxe ecosystem.