Escape Velocity is based around classic shoot em up game play but is combined with procedurally generated levels. It is free to play and includes in-app purchases that range from $0.99 - $9.26 per item.
Ranked in these QuestionsQuestion Ranking
Pro Amazing graphics
Really nice graphics different type of spaceships, awesome environment.
Pro Open exploration
There is a non-linear game play you go your way as you wish there are no limits.
Pro Replayability through randomly generated levels
Randomly generated levels and enemies you never find the same way.
Pro Unique weapon system
The ship and the weapons can be upgraded. First time the system looks a bit weird but you can get used to it.
The tutorial could be better to make it clear how the mechanics of the game work.
The GUI of the game could be more clear with easier to find the options.