get tons of upgrade points at the start by buying the money upgrade that gets you 500$+, then keep playing mission 1 and put two fast towers in the two spaces where the towers go up,sideways then down at the start. it also help when you have a tower damage upgrade of 3+
okey.... its 2d pixelated platform game.... move with arrows... well i know that. " click on the screen and move to find a new prospective " well... what do you me- oh my gawd! so epic :p