that is quite the awesome sauce. simple, challenging...fun. the trifecta.
and Ethan is correct. mouse based manipulating will make the game more intuitive. precious seconds are lost looking for the right tool. the fact that you want to find the tool quickly, is a testament to how fun the game is. it has a simple, but engaging tension like your zombie game.
very nice mechanic as well. kids and adults can enjoy it.
@harrio Ethan - thanks you guys, I'm glad you liked it. And based upon your suggestions, I have implemented mouse controls, too. I originally made the game for Touchjam, so touch controls were first and foremost. But, give it a try now with the mouse. You might need to clear out your cache, which will lose your times, but with the mouse, you will probably be faster anyway.