Nice game, but way too easy. I didn't even need sleep! Get the new revolver and buy both upgrades on the first truck. Buy 2 of the 50% slow traps when the trap truck comes and put them at the entrance. Buy the M5 when the gun truck comes again. That's all you really need. All the while you repair the balloon when you can. With the M5, you can just spray the whole mob to death and repair while reloading. You should finish just after the first day.
those who are saying it's a demo: what you get with the full version is creating/sharing your own levels. what's available free of charge is a fully featured solid and enjoyable puzzle game with a lot of replay value - you can solve the same level an infinite number of ways.
without carrying on playing: "it's clear to everyone that he will become: COMPLETE UNKNOWN (this is a tier 12 result) anonymous's final score potential is 45530"