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Haven't had it crash on me so far, though I don't know what circumstances under which it crashed before.
I played the Version 2.0 about 15 times so far and it only crashed once (and that was not game breaking, I could resume at the beginning of the floor). The bugs seem to be gone... almost It is very well playable now!
Yes. Pretty much all of the bugs have been ironed out since the original release. There are only one or two which happen every once in awhile now, and they usually aren't game breaking.