Retro Rogue is a roguelike game that cost $0.99 and has zero in app purchases.
Ranked in these QuestionsQuestion Ranking
Pro Simple gameplay for newcomers to the roguelike genre
For those that are new to the genre Retro Rogue is a good game to play to get their feet wet and learn the mechanics.
Pro Slider for graphics to emulate look of playing on a CRT
There is an option in game to allow an effect on the graphics that makes the game look as if it is being played on a CRT.
Con Not a free software
There are some libre alternatives.
Con Not much replay value
Once one has beaten the game, there is not much incentive to play again.