Pure unadulterated shooter fun and very addictive, great blend of difficulty and power ups making you feel OP at times. Super satisfying to beat after many tries, and in many ways perfect gameplay. Gameplay in general could not be more visceral for a game this simple. However, it obviously is no looker and very simplistic in terms of presentation. Music is actually pretty impressive for its age though. Gotta play it if you're interested in the shooter genre.