A little late of a review but, it needs said.
This 'game' is a nifty concept. That's the end of the positive.
The programming relies on too many crutches and flat out amature hacks which leaves the program barely stable. A brief search online easily shows the sheer volume of people having problems. Despite this, there will be NO fixes as the dev and his team are too busy working on an all new version to SELL you again!
This leads to the next problem. The dev and his team. From late 2011 through 2012, a free copy of the next version was promised to anyone who had purchased this version. Opening themselves to a class-action, the dev and his team have publicly announced that they will not honor their promises. In effect they have LIED and made money off of that lie.
(Shame on you Steam for allowing this. Shame on all of you appologists for defending this kind of behavior.)
Between the hack job that this game is and the disreputable behavior, I strongly recommend that you avoid this dev!
Unless of course you're the type that likes to pay for a defective product that won't be fixed and being lied to..