To the Skies

This is the first game I have programmed using Python. Any encouragement or constructive criticism would be helpful! 

CONTROLS

WASD to control the balloon, mouse to aim and fire.

Collect coins and shoot birds, while avoiding spikes and birds. Clouds will blind you.

Upgrade your balloon's speed, the value of coins, your balloon's health, and your gun

Periodically fight a miniboss and try to reach high score thresholds for medals.