Update for Windows version and some changes

1. Updates:
   1. - Fixed a bug that prevented both the first and last boss to be damaged by normal attacks.
   2. - Readed some particles effects that went missing after last update.
   3.  - You can now Press "1" to pause the game and skip intros and the "Controls Screen".
2. To fix: 
   
   1. Multiplayer not working with gamepads properly (same gamepad controls all ships).
   2. UI Pause Menu buttons not working.

Aside from this, I've decided to make the game free with the option to donate. If you encounter any other bugs or would like to have something added or removed, please don't hesitate to leave a comment.