This is my first flash game that was done completely done by myself. It seems that the number one factor for making a popular game is POLISH. You can have incredibly simple gameplay that has been done over and over, but as long as it is very polished, it will be popular.
My other flash game, Stay Up, received about a 3.2 out of 5 starting rating. Tunnel Syndrome received a 2.85, this is obviously because of the lack of polish, lack of testing, and bugs. Atleast I learned the lesson of test, test, test, polish, polish, polish.
The law of exponential returns is true.