Sixth Extinction game has now been released for free of charge. The reason being that not that many people have played it, and I would like to more people to enjoy it.
If you have purchased the game, then email me about it and I will give my next game you for free.
In addition of changing the pricing, I also went through and fixed some bugs and did performance optimisation. Fixing bugs included to reduce the volume of environmental music to balance the sounds, and not waiting piano sounds to end when finishing a level, if piano volume is set to zero. There were also other minor fixes. Also, I added one hidden level to the game and option to get a little surprise (list of secrets, trivia and a demo game) by joining my mailing list.
Android and iPhone versions are also going to be released for free.
Thank you for playing the game; I would love to hear what you think about the game!