I'm glad you like the game! There is no in-game key assignment, but did you try the key assignment menu in the game launcher under the "Input" tab?
Sorry, i forgot to tell my OS. I have this problem on the linux version.
I don't know why, but on most games, the launcher shows up, but there, noting. I can always loadkeys my linux, but it's kinda annoying (especially when I'll leave the game, I'll forget to change again :facepalm: )