Every time you finish a level you are put in a new location with a new gun, and you must survive as many levels as you can. Every five levels you must face more enemies. It has a zombie mode, gamepad support, a custom rules mode, and two-player local co-op.

Features
• Two-player Co-op (Local)
• Custom Rules Mode
• Zombie Mode
• Ten Locations
• Ten Guns (including cross bows, rocket launchers, and mini guns)

Try the Demo
https://play.google.com/store/apps/details?id=com.grantsgames.GunUpgradeDemo

More Details
Offline: Yes
Input Methods: touchscreen, keyboard+mouse, & gamepad
Players: 1-2 local co-op
Export/Import Save: Yes
Save Files: 4
Install on External Storage: Optional
Multi-Window Support: Yes
Categories: top-down shooter
Themes: 2d, war, survival