hell, i agree with the low quality thing. even though i just got a computer upgrade, my old computer can't play this game for sh**. i can finish 50rounds here in about 25 on my old one. the Kreds part is optional though, you can get ranks without them. its just for lazy rich people.
5:48 - you can get the super fast gun w/o beating the boss. just jump on the top platform and rocket boost across. then either kill him w/ super fast or just die to get back to the save point nearby.
i find the last level to be enjoyable at around the 1/3 mark, when you finally start to get a good base. 30 or so speed upgrades makes it a near instant pass to the outposts, saving a bunch of time on expanding too.