I've changed how the levels progress and added an extra planet so you don't get all the upgrades until you have mastered the 3 new ones in levels 1 to 3. I've also provided some cash between each new level to make the early game a little easier so you can focus on the new upgrades and how it will affect the game.
I've also redone the UI to a neutral grey as the green wasn't working for me. Some other visual updates have also been worked in.
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