Scavenger

In this game, the player plays as a scavenger, who can collect coins and buy power-ups while protecting the space station by shooting valuable coins towards hostile aliens. It is all about making decisions on whether collect coins or use them to attack, the coins play two important roles, one is giving the powerful ability to players which most of the time can save lives, the other one is (the only way) to attack. The design leads to dynamic decision-making. The smart way to do it is to wait until the enemy comes close enough then kill it so that the least coin is wasted.