Hold the mouse down on the box on the bottom left to get EXP, and you will get points for leveling up. Hover over the +s to view the upgrades. More upgrades appear when your level goes up. Click the diamonds for bonus points. Version 0: Five upgrades. Version 1: Added another upgrade and music and volume. Version 2: Added a tier 2 upgrade, added two more upgrades, one of them drops the price of the others. Version 3: Made it MUCH easier to level up and get points. Version 4: One new upgrade. Unlocks at level 25.
Credit to everyone.
