HTML5 Worlds Within Worlds - A retro-platformer (with co-op assist mode!)

Worlds Within Worlds is a no-gimmick retro-platformer. Collect 3 "Golden Leaves" in each stage to unlock the next world! Every stage is designed to be completed with zero-hesitation, if you fancy yourself a speedrunner. Play co-cooperatively by summoning the "Support Butterfly" to freeze enemies in place!

I've been building this platforming engine for years. "Worlds Within Worlds" is the second project I've released, and I'll continue to add new levels to the project over time. The game is playable in-browser, but for the best experience, consider downloading the EXE.