After watching three separate games all have the exact same memory leakage problem and it still has not been resolved, I am seriously doubtful the developers of this potentially awesome game have any clue how to fix it. Like so many potentially great games, its sad implementation that has ruined it and the developers rep.
Beat the game in 17 days... Get the Laser Rifle ASAP! Building order: Workshop > Mine > Foundry > Machine Shop > Shield Generator > Chemical Refinery. Once you get the Laser Rifle, get Artillery Piece. Between gas attack and laser rifle you don't need to get any more weapons. Then just buy up every other building you can.
The game is really quite simple, the hardest part badge wise is just finding the blue chests if you don't have maps. Other than that its easy, if you can't kill something yet, go train for a few weeks and go back.