Thank you so much for playing and taking the time to leave feedback!
I originally styled it after Friday Night Funkin' or osu!mania since people are accustomed to that layout (though I just realized I swapped the up and down arrows, lol!). However, I agree that adding an 'ASDF' option is a great idea. I'll add it in the next update.
Thanks again for the support, more to come soon! •ᴗ•