I think this is a good idea. It looks like they are doing well.
I have played a bit of each of them and they are all fun to play. My favorite is machinarium I have always liked the point and click games. Cortex command is a lot of fun but needs improvement. Cortex command just about overheated my laptop I had to turn it off and put it infront of a fan. But it is fun to play.
I think this is a great deal and will hopefully get more people into buying indie games