Oh my, day 3 began already, and my game is still missing features. But my plans today are as follows:

• Add a HUD to the game. Should contain money indicator, selector panel for defenders.
• Game play button, the game should start after customization, one can only play against waves after customization.
• Allow to upgrade automatic turrets!
• Sound effects!!!

And if time permits:

• Redo graphics so they are a bit nicer
• Make asteroids appear only when you have money

Ignore my handwriting, I'll meet you in a few hours.