A call out to FTL, PSI lets you create and build your own submarine as you take across the ocean to defeat an enemy general. Control your weapons, shields, ballast and engines as you keep your systems online, prevent floods and put out fires while in deadly combat. Also featuring side quests and a free roam ocean, PSI is a nearly endless experience.
PSI technically had a handful of challenges; namely the state of cellphones in 2014. Optimization of loading, grid layouts (Since it featured custom ship building) and AI was a priority, and a handful of tricks had to be employed to make the ocean scenes believable.
PSI was released in 2014, and was one of my first ‘big’ games. Although it is no longer in development, the website can be found here: http://psi-game.com/