what should an Exile sequel be like?
What improvements should it have?

Should it be just an update with better graphics?
Should it be a sequel in the sense of storyline on another planet/ another scenario?
The latter would need more entities designing and implementing but how could the gameplay style be retained unless it was another cave system?

Somebody mentioned a deathmatch-style scenario. Maybe this woud be a valid and feasible extension to the game. There would need to be much less puzzle-solving of course for a deathmatch and more object collection for say, opening doors/traps etc.
Maybe the Exile gameplay would not fit this kind of premise though?

However, in todays RO climate I would consider writing it in such a way that the code can be passed to another platform.

There are graphical improvements possible that Simon storr started such as lighting effects. However, what would be the point of a conversion if the original can be played under emulation.
You see, the Amiga versions had better (more detailed generally and more colour) graphics but many still say the BBC was the best version.