Badge: Get all trucks from last tier and max them. Put the "Booster" in front. Remember that your rail gun always shoots at your mouse cursor, so dont slow down your mouse movement because of the lagging laser.
If your screen only displays half of the game, try zooming out your browser (CTRL-Mouse Wheel) and make the flash window smaller. Worked for me. + if helpful
The game idea is good and addicting, but there is always a chance that you cannot win a level, because a key-tile won't show up. And there is nothing you can do about it. Very sad when you reach lvl 29 and cannot save and you lose because of RNG.