29 was my highscore. I enjoyed the general gameplay and the presentation is quite nice. However, why does "restart" (which has a loading screen) take you back to the main menu? Please just let me replay the game.
I also don't understand the purpose of the countdown, it just wastes time and the first demon spawning is telegraphed with the portal anyway. This is a die-often, score-chasing game; anything that slows the player down between attempts is frustrating and there didn't seem to be any purpose for these delays.
Sorry to nitpick. I just think it could be more player-friendly. The game is fun and it achieves the shooter without shooting concept pretty well.