This game was unfortunately released shortly after Doom, meaning that it had to compete with one of the best 3D shooters of all time using ... the Wolfenstein 3D engine. Not even a fair fight, really. While the game is decent enough, its pretty obvious that its using the Wolf3D engine, with its boxy environments and simple sprites. Overall, it has decent graphics (again, comparable to Wolf3D), and it could be enjoyable if you force yourself to forget about Doom and play this game based on its own merits.