I know it's been ages, but I still play this game. It's actually really good! My highest score was 74 monsters and 5 and a half minutes. Sometimes it's hard to tell when the monsters are close enough to shoot, which is important if you have so many that every second counts for reloading. I love the upgrade system and the randomization of it. I know that your submission was late, but honestly you could have been in the top 5 with this one otherwise. If you ever wanted to sell it, I would happily pay, just saying. Addictive stuff!