Control the spaceship to fight against the invasion of alien forces, collect coins and reasonable upgrades to make you stronger in this long war.

Upgrade instructions:
- Slow: slow down the enemy's progress.
- Firing speed: increases fire rate of all weapons.
- More bullets: increase the amount of bullets fired.
- Power: increase the power of all weapons.
- Health: increase health.
- Laser: activate, strengthen and increase the number of Lasers, Laser deals piercing damage.
- Missile: activate and strengthen Missile, Missile deals damage within explosion range.
- Crit rate: increase critical rate for all weapons.
- Armor: increases armor by percentage.
- Resources: increase the amount of resources obtained when leveling up, eat rewards