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What are your favourite open source games?
(beehaw.org)
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VVVVVV. It's not GPL though, so technically it's not open source, but source-available.
Note that while the source code is available, the assets is not, so you'll still need to buy the game here: https://store.steampowered.com/app/70300/VVVVVV/
There are many things that use a license that isn't GPL that area still open source. I haven't looked into this one past the fact that it's a custom license though. So it'll probably depend on your definition of open source.