Welcome to Silly-Game-Tries-to-Tell-A-Serious-Story, Chapter 2!
As following events of Doodle Taxi, the Witch (Eval-Inn) decides to go back to her realm and reclaim her throne. And since the government doesn't want to keep this dangerous woman around for any longer, they promise to oblige. Since the Witch became fond of you due to your impressive personality, she asks for your help to get her throne back from her son. As a former military member, you have to go through a magical forest, fight magical creatures and reach to entrance of her realm.
ASTEROIDS RAINING! - Progression and Rewards
Only problem won't be asteroids though. You'll face various "Guardians of the Forest" and they'll bring their own unique methods to get rid of you. Like a body's immune system using harder methods to fight viruses off, the Forest will send tougher guys to take you down. Asteroids will grow, more of them will thrown to you. More and more insects will attack you and each Guardian will be stronger than previous ones combined.
You can gain experience points and score by shooting asteroids and creatures. Each time you earn enough exp to level up, you will get to choose a perk. Also, you will get an upgrade on your weapon each time you defeat a Guardian.
Once you clear all of the Guardians, the Forest will be safe to enter for the Witch and your asteroid patrol will be completed.