I like the gameplay concept. For some reason the page still scrolls up and down whenever I use the up and down keys, as has been a problem with others in the past. This is especially of concern to me, as I'm used to using the arrow keys as opposed to WASD, which may not exactly be helpful because I'm left-handed - I'm a leftie, you know.
But hey, it ain't no QAOP, as was common on the ZX Spectrum back in the '80s and some owners back in the day will be no doubt nostalgic for, and maybe they got used to it too. There's even an emulator of, yes, the ZXS, named after it!