Yeah its never easy. But it is also plattform specific and if you want to do any sales. A game on a iOSapp store or mobile in genreall will bem uch cheaper than its PC version. Xcom cost around 50 € at reales on PC and only 18 on the app store. (I think there was half a year between the releases, maybe more.) It's important to look at comparable games on YOUR release plattform.
If you want to use the momentum of sales for your game you should give you some wiggle room in your initial price.
I nearly forgot one of the most important rules of selling:
It' always easier to lower a price than to increase it.
Price reduction is one of your most important tools in selling your game. Use it wisley.