scored 52 first go. Had no trouble timing the bridges or telling depression from mound. Power though was difficult to judge, especially when you get closer.
Unlike most, I didnt use Machine Guns, I chose Electro Towers instead, and was unstoppable. I feel that there is not enough variation in the enemies, once I had my defense line set up, I didnt care about what the colours were. Upgrades were useless, there was no point in them, they didnt change anything enough to make me want to get them.