As fuel is constantly depleting, you have to fight to gain some loot, like fuel to keep on flying, and maybe if you're lucky some health and/or armor.
Create reputation system: increased number of battles on a short period of time increases difficulty (greater number of enemies with increased health points, powerful shots and erratic behavior) but also increases rewards
Parts: rewards after battles that works as the currency in the game. To repair ship, buy and upgrade equipaments, weapons and ammo
Restart after gameover
Sound for shoots
Sound for encounters
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