Skills/Upgrades

Skills are things that make your copter better. You gain one skill point each time you level up, and you can upgrade one skill once with each skill point. There are currently 9 different types of skills, and the maximum number of upgrades for each skill is 9.

Here are some of them:
 * 1) health
 * 2) health regeneration
 * 3) armor(body damage)
 * 4) bullet speed
 * 5) firing rate
 * 6) bullet size
 * 7) bullet damage
 * 8) movement speed