Wow
What can I say? This is an awesome farking game you've made here. Addictive, challenging, funny as hell. My only suggestion would be to add powerups like different guns, speed, or weighted boots for your cows so they don't get sucked up as fast. You could also make it so that the bombs sometimes contain powerdowns like helium or sticky goo so you can't move.
So uh... yeah. Sorry, got a little carried away there. Anyways, awesome game, make another, etc. etc.