As written, you can Sustain multiple times around, which is pretty good. Maybe too good. Might be why there's a 3gp cost, though that becomes trivial as you level up. It would be interesting to compare the math to Slow.
As to the second question, conditions never stack unless they specifically say so.
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Applying a condition twice never stacks to a higher condition unless the effect specifically says so. Mind Games doesn't say so.
As for sustaining multiple times per round, that could be debatable, dependingon whether you're just looking for RAW (which would be a yes) or trying to determine RAI (which is a question mark). Mind Games doesn't have the "the first time each round you sustain" language that dome spells like Flaming Sphere were changed to in order to prevent that kind of use. But whether it's because Mind Games is intended to work that way or because problems seem to slip through more frequently in things that are published in AP backmatter is hard to say.
Yeah, the AP content doesn't get vetted nearly as much.