Recs.
Updated
Galaxy on Fire 2 is an arcade space combat & exploration game that is free to play but does include in app purchases. You can mine asteroids, explore 30+ star systems, fight aliens/pirates and upgrade your ship. The single player campaign is about 10 hours long.
SpecsUpdate
Pros
Pro Offline single player gameplay is great for players that don't always have an available internet connection
For players without internet or those just wanting to play without the interference of others, Galaxy on Fire 2 HD is a single player only game. Galaxy on Fire uses a few different types of game play, story-driven, mission-based and sandbox modes allow you the player to be in control of how you play the game.
Pro Nice graphics and music
The graphics and music are very well done. The music is slightly dynamic in that there are different scores that play depending on what's going on in the game. The graphics for this were good even before the update and are even better since it was updated. Many have said they are nearly 'console quality' and they are right. The graphics are actually better than a lot of console games out there and even better than a few PC ones.
Pro Updated HD Graphics over first title
All of the graphical textures and effects have been updated and reworked from the original game Galaxy on Fire. Including highly detailed 3D models and stunning specialFX, Galaxy on Fire 2 HD graphics are optimized for Android devices and provide beautiful visuals.