Glad you liked the artwork! And that's not a bug, just an "unfinished" situation, unfortunately — the drum track was the one we fully built out, and the other instruments were rushed together after, so they cut out early instead of running the full song.
Really like the ZXCV suggestion too — a straight row like that would definitely be easier to hit than the arrow keys, especially compared to trying to contort one hand across them. Good idea to keep in mind if we revisit this. Thanks for playing!