Oh yes, I remember the days of Robocop of the ZX Spectrum all too well!
I remember how pleased I was with myself when I eventually complete it.
Jet Set Willy, however, was another story… I still get nightmares about the Jet Set Willy in game “ear worm” as I see Willy plummeting to his death due to a badly planned jump! 
The youth of today, don’t know they’ve been born. At least they never had to put up with loading a game from audio cassette for 5+ minutes, only for it to fail with the dreaded R Tape loading error, 0:1