Incredible in that it almost feels like a modern roguelite. I found myself in a cycle of traversing maze-like levels, finding hidden powerups, dying a lot, and starting over until I'd mastered it. If the levels were randomly generated, it'd be hard to tell the difference between a modern game, I think. But that's what could have been, what it is, is a tight, satisfying, action game. Short but sweet, and worth checking out if only as a historical novelty.