No worries, Thanks for checking out the game!
There's actually W,A,S,D + Left Click support in the game, I just didn't want to clutter up the instructions page so I didn't write them in (should've written them in regardless but hey, better late than never I guess XD)
I've updated the page to include the alternative control layout, feel free to try it out. It does still take some getting used to but I hope it feels a bit better!