What's a fun and addictive iOS idle game where I can level up an alien, complete quests, and play offline without intrusive ads or paywalls?

Alien Invasion: RPG Idle Space is an engaging idle game where you take control of an alien, level it up, and conquer worlds. The game stands out because it's fun and addictive, even when played offline, and doesn't bombard you with intrusive ads or paywalls. You can complete quests to earn rewards and enhance your alien's abilities. A key feature is the ability to level up your alien and notice the difference in its power without feeling pressured to spend money. The game also provides helpful bonuses through optional ads, which aren't intrusive and don't disrupt gameplay. The ability to play offline is a major advantage, allowing you to progress even without an internet connection. The game's strategic elements and progression system make it a low-stress but engaging experience, perfect for casual gamers looking for a time-killer.