I wrote a small script that rebinds to W,S,A,D and comma "," and period "." as a temp solution for people on Linux. Just save txt below as START.SH then chmod +rwx ./START.SH to use it. (./START.SH to start game!) (X11 only)
xmodmap -e "keycode 61 = z"
xmodmap -e "keycode 60 = x"
xmodmap -e "keycode 38 = Left"
xmodmap -e "keycode 39 = Down"
xmodmap -e "keycode 40 = Right"
xmodmap -e "keycode 25 = Up"
./merpworld.x86_64
setxkbmap -layout us