The duty to defend your last position

Author Comments:

You are the last soldier in your last position to defend. Upgrade your weapons wisely, and buy 4 weapons with unique strengths.
Better scores are awarded for earlier kills. Better money prizes are awarded by accuracy bonuses.
Update:
Due to requests, the "r" key reloads the weapon too.
The game difficulty is more balanced. And a score bonus is given for a harder game.