@cody-raethke Do you perchance have a github account? I'd be immensely appreciative if you could file your findings here: https://github.com/virtuoso/clap/issues/new/choose, because they'll get buried here. The fact that you're on Linux should actually be an advantage: most of the development and testing on my side also happens on Linux. Also, do you by any chance have a game controller connected (that is not in my copy of gamecontrollerdb.txt)? Lastly, can you run https://ash.works/clap/ldjam57.exe under wine (vanilla wine9 works, maybe earlier ones too)? In the menu there's "Devel" that opens a window with a bunch of checkboxes, if you tick "character motion", I'd like to see "motion", "angle" and "velocity" vectors when you're not pressing anything. Also, everything that it spits out to the console can potentially be useful. There's also a linux build with debug UI enabled, it just doesn't get deployed at the moment.
And yeah, thank you for getting back to us and reporting! It's a new custom engine, so silly bugs are inevitable.