For what this is (a preview) it's not bad: well designed but with a clunky interface. Work on getting the controls a bit more friendly (especially the camera) and then think about adding menus, music, content, some sort of story or objectives. Still, the environment works prety well...and a ram: hoe exciting :)
Anonymouse123e is right. quickly get a lvl 2 gold mine and a farm out, then get units to level 2. from there work on slowly upgrading money and units, sending out units every now and then to keep control of the map. units cap at lvl 11.. get them there and then just send out a ridiculous amount. you CAN WIN eventually. i did --> 3 lvl15 gold mines, 1 lvl 11farm , 1 lvl 11oil, units at lvl 11... just kept a steady steam of units accross the whole map till "You Won" popped up :)
5/5 excellent game! challenging but not impossible. got under par on 28. like the morse. like the russian.
also 39 on normal and bonus is quite possible, even with a touchpad. gl!