Most everything. Starting the game, playing the game, saving the game, exiting the game, loading the save, switching between windowed and fullscreen, all work perfectly. No noticeable issues with the graphics or sound.
What does not
Apparently nothing, but see below.
What was not tested
-There is a free demo, but it uses an older version of the underlying game engine (GameMaker) than the full game does, so it can't be treated as equivalent for testing purposes. For the record, the demo also worked perfectly except that it put up a dialog box with a fatal error/crash message when you would go to exit it. (The full game doesn't have this issue). -The reason "Installs" is listed as N/A is that the DRM-Free version does not have an installer, but is distributed as a single binary with all assets embedded into it, that can be run directly without extraction.
|Operating system||Test date||Wine version||Installs?||Runs?||Used|
|Show||Fedora 23 x86_64||Apr 26 2016||1.9.8||Yes||Yes||Gold||Philipglo Joshua Opulencia|
|Show||Debian GNU/Linux 8.x "Jessie" x86_64||Apr 12 2016||1.9.7||N/A||Yes||Platinum||firencombomaster|
|Show||Arch Linux x86_64||Dec 29 2015||1.9.0||Yes||Yes||Platinum||an anonymous user|
|Show||Arch Linux x86_64||Dec 06 2015||1.8-rc3||N/A||Yes||Silver||Mike Swanson|
|Show||Debian GNU/Linux 9.x "Stretch" x86_64||Dec 20 2015||1.8-rc2||Yes||Yes||Bronze||an anonymous user|