"Contrary to popular belief, both Dragon's Lair and Space Ace did contain diagonal movements. In some cases, these movements were simply the combination of two acceptable moves, while in other cases the diagonal move was distinct (for example, during the whirlpool segment, moving to the right or left is acceptable, moving diagonal up-right or up-left is acceptable, but simply moving up results in death). In all cases, the diagonal moves were optional, and there was always a 4-way alternative. The '91 re-release of Space Ace contained some diagonal moves that were required."
Shit, if I only knew that back then.