Distractionware has released the source code for their VVVV VVC platform game to mark its 10th anniversary. You can now download the game engine to make your own modifications or get a better understanding of how the game works. The source code does not include any of the images or music for the game as it is under a proprietary license. Users who wish to use these assets can download the Make and Play Edition, which includes a level editor and the player levels. The game has an “Overwhelmingly Positive”” rating on Steam.”
Source: https://www.bleepingcomputer.com/news/gaming/vvvvvv-source-code-released-to-mark-10th-anniversary/