Nova the Squirrel by NovaSquirrel is a brand new platformer game for the Nintendo Entertainment System, playable in an emulator (such as Mesen) or on a flashcart such as RetroUSB’s PowerPak. Explore 33 levels and fight 7 bosses across five different worlds in an attempt to save the world of Latte from the evil “Scheme Team”!
This game is open source! You can find its source code at its GitHub repository. While the tools are not very user-friendly yet, if you feel like getting into the code you can build new levels for the game with a drag-and-drop level editor, or modify the game as you please. Later there will be a separate game engine release, for building entirely new platformer games.