Space Defense HD

Space Defence HD is just a Missile Command replica, features:
This paid version lets you upgrade your weapons as you progress through levels.

Upgrades: power, speed or number for shot.
Hit the enemies in combo to get more points.
Defend the spaceships, they will support you!
Build the shield and try to save the Earth.
Survive to an indefinite number of enemies waves.
Hit with precision and get double explosion and score.
Billions of people believe in you!

For any question or suggestions please email me to beegrooveapp@gmail.com or through the website: http://www.beegroove.com

Tested on devices (tablet/smartphones) with screen size from 3.5" to 7.7" (Nexus 4,Nexus 7,Galaxy S3,Galaxy S2)

A game entirely created with free software:
Ubuntu 12.04 LTS (The OS)
Eclipse 4.2 (Java/C++ IDE)
libGdx 9.8 (OpenGL/Audio library)
Ghex (hex editor)
Gimp (graphic editor)
InkScape (vectorial graphic editor)
OpenShot (video editor)
RecordMyDesktop (video capture for linux)
AudiaCity (audio editor)
Git/ColaGitGUI (source control management)
Bitbucket (free repository)