Amazing homage! Congrats!
Works as a charm in ESPectrum. No problems seen with fast loading. ESPectrum "Fast tap index" feature can be used too (it speeds up, making load almost instant, loading taps with many blocks as Final Pack's one) but as your .tap don't have too many blocks it makes practically no difference.
I played it at 125% and 150% speed with sound and it's quite enjoyable! :D
As pointed below, a .trd version would be wonderful. ESPectrum and many other emulators can load .trd disks in any model of emulated Speccy not only Pentagon.
Also support for second Kempston button or even more buttons would be nice. There are a lot of possibilities today for real machines and emulators to take advantage of modern gamepads.
Anyway, as said at start of post: Congrats! Great work!