Fire enemies could be strong against fire attacks, and ice enemies weaker. There should be many more skills and the enemies should be a lot stronger and with different powers to make the game more challenging!
Use fuel near the floor so you can hit a windmill (or a star, or a bird) and fly back up. And save for buying better planes, they are tottally worth it! And use most of your fuel searching star and birds, then use THEM to go up, NOT THE FUEL.
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