First of all I want to say how awesome it is to see a site like this. There's so much great stuff being made by Joe/Jane Blow and it's great to see a market place for them. (Computer Open That Door is the first time in a long time that a game has made me laugh)
I do have one question about downloading in general.
Obviously these titles are provided as-is, any damage is the user's to take care of/prevent.
However, what steps can I as a user take to prevent issues. To give an example, I downloaded another title, started playing and it crashed my system pretty badly. No keyboard response, screen turned to a jumble of random coloured pixels. I could only get it back to the desktop by hard reseting my machine and entering Safe Mode and then rebooting again in normal mode.
Not looking for a solution to this specific problem, I just want to know what permanent risks I may be opening my system to and secondly, what kind of things do other users do to protect themselves. A virus scanner is the most obvious tool but what about non-malicious stuff like I described above?
FYI, I'm using a mid-2010 iMac with OS X 10.8.