HG is one of the few games from that era that I actually finished. At the end it played through each of the characters and told you what happened to them in the future. The intro music and ending music were fantastic.That was always one I look at through rose-tinted specs. Never got very far as it was too hard for my child brain. Looking at a walkthrough on YouTube, it would probably still beat me today.
My favourite was Driller featuring Freescape. Spent many moons playing that over and over again with its sequel, Dark Side.