Hurrican (Turrican Clone)
Hurrican is a rather unknown open-source clone of Turrican (the classic 2D action platformer of Amiga/Commodore 64 fame). It appears to be surprisingly polished, considering its obscurity. Certainly deserving of the appimage treatment. :)
Here's the link to the project's website: https://www.winterworks.de/project/hurrican/

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I just built a Hurrican AppImage, you can find it here: https://sourceforge.net/projects/pg4l/files/Hurrican%201.0.9.2-r1-archlinux-x86_64.run.xz/download
Could you please give it a try and tell me if it works for you?
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Hi! Thanks for the suggestion, an sorry for the late reply
I'm not sure I'm going to be able to find time to package and test this game, but if the creators or someone else in the community is up to the task, I can help!
Looks like there's only Windows builds available, so they would need to be packaged with Wine: https://github.com/RazZziel/PortableLinuxGames/wiki/Creating-appimages-from-Windows-applications
However, according to https://github.com/NebuPookins/hurrican, the game builds fine on Linux, so the best results would be to build it in a old-ish distro and package that