How?

I find this game really hard to last long in. Once those UFOs come, I'm toast.

What's your tip?

meh... the super tower is too powerful.

i finished it, too. it's just a matter of maximizing your score.

14048... not sure what these people are doing for 60k+ points.

22847 on my next try. i could have gotten more if i were a bit quicker with selling my last towers. i believe your get your gold added to your final score.

anyway, the key to maximizing your score is compounding interest. for example, 1 gold saved in the first round earns you about 64 gold (or points) at the end of the game (at 10% for the first 14 rounds and 15% for the last 21). that extra upgrade in the first round is a HUGE waste.

i think the key to a really high score is to know when the "tough" levels are and destroy your unnecessary towers after the "hard" levels. the interest you earn is pretty substantial at that point.