A remake of Future Knight by Johndimi is available (original game out in 1986).
This PC version pour PC has a map design which doesn't follow the original game but rather designed from scratch. Some game mechanics are improved, like the ability to move while jumping, having an inventory, faster gamespeed, etc.
The game features 7 levels. There are enemies to kill, items to find and use, keys to unlock doors, traps to avoid, shortcuts to take, new weapons, and bosses to exterminate.