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SuperTux Advance, an AGPL licensed platformer
(github.com)
I won't lie, I got excited for a moment there because I thought that it was actually a gameboy advance game.
Looks VERY interesring. I especially appreciate the 16-bit graphics.
I love it being written in Squirrel. Last time I dealt with it was when I was modding Sonic Unleashed on PS2 (Wii/PS2 version used it as its scripting language).