Win the invasion by shooting down aliens, bosses,collectingpower ups and coins. Spend coins on unlocking newweapons,upgrading weapons and buying new badass vehicles.
Power ups have a chance of spawning when shooting down UFO’sandbosses. Be sure to collect them before they disappear.Availablepower ups are:
1) A vehicle acceleration speed boost
2) Shooting speed boost
3) Vehicles repair
4) And a jamming signal which temporary halts the invasion
There are 2 ways how you can lose the game, either bydepletingyour Health Points, or by allowing three UFOs to reach andland onthe ground. Health Points are lost when the UFOs activatethetractor beams and try to beam you up. Due to thealien’stechnology, you shrink when you lose health. So the morehealthpoints you lose, the smaller you become. Another way oflosingHealth Points is by taking damage from the boss.
Each wave has a boss which will be continuously harassing youina number of ways like shooting you, healing and protectingenemies,and spawning aliens faster. The boss shootingpowersincludes:
1) A freeze ray which stops you from controlling your vehicle
2) A reverse ray which alters your left right controls
3) A slow ray which makes you go slower
4) An EMP ray which stops you from shooting
5) And finally, a normal damage ray which chips away yourhealthpoints.