Key to an amazing run: Buzz the tower for every green gate until either A) you are unable to hit one because of positioning, or B) around 90x multiplier, then only buzz the tower when you know for sure will be possible. By now you should already know this, but dont make ramps, this will only lead to your downfall. If possible, make EVERY tunnel perfect. It will make your score double garunteed if you hit 2 more perfect tunnels above 100x. On 200x (if youll ever make it that far) you will most likely get 100,000,000 or more from each perfect tunnel. And of course, avoid the red gates ;)
absolutely love this game... just broke 100 mil, and got 136 mil!
The secret is to get perfect tunnels while in a high multiplier, i was on x132 and got 50 mil for one!