Bug fixes and Added 2 new cheats.

Bugfix:

- Monster's bullet still shoot the player while changing wave.

Other:

+ Press "=" button on your keyboard to instantly add 15 score on the stage 1. Below are the following score required each wave :

    - Wave 1 : 15 score

    - Wave 2 : 30 score

    - Wave 3 : 15 score

+ Press "]" button on your keyboard to instantly kill the boss during stage 2.