Thanks, that is generally good advice. I will say the one reason I haven't actually tried you game is that I only see versions available for Windows. I usually only go to Windows to work in the Unity editor (which still just works better there and allows much better IDE integration) -- and then I just want to shift back to Linux. As strange as it may sound, I play games exclusively in Linux, and only even installed Windows to try tinkering in Unity and UE4.
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Well, it gets stuck in the dialogue if I talk to the anime girl on the dock, being effectively locked up at that point. It also locks up on the start screen after dying, so I can't try more than once without killing the game on the command line and re-starting.
Also, probably not linux specific, but what seems to be the strong attack (block then attack giving the thrust forward) allows the play character to move over obstacle that normally are barriar to get stuck (on the dock).