So... your ONLY criticism was that the Indians are introduced too late and fleetingly (if I'm reading your review correctly)?
The fact that, oh, I don't know, a hugely advanced alien species capable of interstellar travel and thought-controlled weaponry, among other fun stuff, but yet who inexplicably act like hyenas in person (and don't seem to keep more than one wrist rocket around the old ship, which they conveniently leave lying next to a guy who also inexplicably is able to wriggle out of a rigid restraint bed - twice!) come all these umpteen miles across space to mine gold because "it's just as rare to them as to you (the humans)", running into same pesky humans in the process, when all they'd have had to do is land on the nearest rocky planet in their own or a nearby system and mine all the gold they needed. Or, failing that for any reason, stop by our own asteroid belt - where, at least according to solar system formation theory - there ought to be many more times the gold available in even the most fecund earthbound mine. To say nothing of Mars. I'm no geologist, but I bet there's LOTS of gold under them red sands.
Then of course there's the issue of why capture humans "to probe your weaknesses" when a good old laser blast from above seems to take care of the problem nicely.