Got this game on sale for like $2, and fell in love with it. The game is well worth a playthrough and is extremely entertaining. It's fast paced, full of secrets, and has a very rewarding difficulty progression. I will say that the atmosphere and theme can be a little repetitive but it's an older game with a heavy emphasis on its arcade play style. Overall the game is extremely engaging with a great on the edge of your seat intensity. You will mostly be running around in arena type square rooms with some verticality facing off against increasingly difficult waves of different monsters while trying to dodge hundreds of projectiles. Definetly buy this game if you are a fan of FPS games.