Good TD! I like the twist on being able to move towers around during the waves which is not really common and adds to the ambience. It was already said but the other great twist is of course the attributes rather than the upgrade. Oh and the story line is cool.
SPOILER ALERT:hard badge 2hrs max
Set-up: guide foes with a raw of basic tower (a line, ~7 towers long, from the main entrance forcing all foes in the same direction, trapping foes between your towers and a wall). The pre-last tower (away from the entrance) is set as area burst (upgrade twice). The last tower is set to booster (for range, if enough money left). Have your burst tower active (click on it).
START: send all the wave at once (click on Start! and send fast click the rest) WHILE upgrading first the burst and then the range. Be fast. Use shortcuts to upgrade. If you have flyings on the map, set 1 anti-fly at the exit and upgrade. Couple with pulse-boost (1 or 2 as needed). The start is hot because you have to do many things at once.
Finishing the game: Now that all the waves are launched you just have to watch the progress of the game and react to whatever happens. Usually, upgrading the burst to max + 2 fully upgraded range and 1 pulse will give is ftw.
I kept trying for medium and hard for hours. I started creating my balls in the top right corner and top right corner only and I got the medium and the hard on the first trial. with 40517 on lvl 20. The idea is that as the ball cascade down (due to the physics of the game) they trap the bouncies and it helps clear the field for more of your stuff.
Keep on trying... and try to change the option... I am under the belief that maybe doing so change the number of point per shape... might be wrong... but I was under 5M and I switched and I got above... getting the Yellow madness is a must whatever happens...