Too simple and too easy. All the enemies behave exactly the same, just charging at the player until they are in melee or shooting range, meaning that defeating them isn't a challenge. The only reason I ever felt the need to swap away from using the starting pistol was a lack of bullets. Beyond that, the music felt repetitive, and while the levels were okay and the visuals mostly fit, the lack of a map got frustrating occasionally and the textures felt uninspired and, again, repetitive.