very fun to play. simplistic game with a lot of fun aspects. the heat indicator is nice but i would suggest to put it near the player or above the aim cursor since that's generally where the players focus would be. outside of that, its very fun. music and sound effects would make this a very good game to come back to and spend some mind numbing minutes blowing stuff up repeatedly. I can see this game being a very popular one with some more polishing. great job and keep up the work!
EDIT: my kid plugged in some headphones and i didnt realize it, ignore my comment about the music/sound effects. they are really good! LOL