I did not make any of the games listed here. Rather, this is my personal collection of Open-Source games you can play directly in your browser.
Also take a look at Libre Game Wiki for additional (not necessarily browser-based) games.
Parallel Overhead is an endless runner game where you take control of the ships Truth and Beauty on a groundbreaking trip through hyperspace. A stable hyperspace tunnel is finally being achieved with two ships locked to the opposite walls of the tunnel. Well, almost stable...
Friday Night Funkin'
Friday Night Funkin' is a free-to-play and open-source rhythm game. Developed by a team of four Newgrounds users, the game has a play style that is similar to Dance Dance Revolution and PaRappa the Rapper, with an aesthetic reminiscent of Flash games popular in the early-to-mid 2000s.
The game revolves around the player character, simply named "Boyfriend", who has to defeat a variety of characters in singing and rapping contests for him to be able to date his love interest, "Girlfriend".
Uh oh! Your tryin to kiss ur hot girlfriend, but her MEAN and EVIL dad is trying to KILL you! He's an ex-rockstar, the only way to get to his heart? The power of music...
Made for the Ludum Dare 47 (2020)