Update from 0.7 to 0.8

List of changes:

1. Added Custom game with a constructor for waves.

2. Added laser recharge indicator.

3. Added explanations for controls to Main menu.

4. Removed "Quit" button from Web version.

Developer comment:

Overall update is adding more variety to the game,  allowing you to customize your own battle.

Add as many waves as you like (as long as it's not more than 99) with your own respite time between them, set how many and what type of enemies will appear, and set the delay between their spawns. Boss will still come in the end, so beware!