CrossCode. It's an SNES-style action RPG with very fun combat, 2D-Zelda-like puzzles, and a genuinely charming well-written story that was made in HTML5 and JavaScript for some reason. It is genuinely my favorite game of all time. I habitually proselyte this game to friends, but check it out for the love of God
Now I wonder how viable it would be to support video hosting. The answer is almost certainly "God no!"