Sky Guardian

It's a story about heroic exploits of the sky guardian.
The game takes place in an artificial world - Avalon, which is freely drifting in space.
The task of the guard is patrolling the heavenly space, and protect the world from all sorts of invaders, who now and then attacked Avalon.
Invaders use primitive vehicles, built from improvised. But there are many of them and they are dangerous.
Each guardian is an excellent mechanic. They construct their vehicles themselves and constantly modify them, turning them into a real angel of death...

WHAT'S INTERESTING:
✪ 3 types of aicraft. Each has it's own abilities. Upgrades are possible;
✪ 5 enemy types with different abilities;
✪ 12 environments;
✪ increasing difficulty.