Bug fix

Endless mode

- Game crashes when the 'Boss-sword type' clone hits the player. (Fixed)
- 3 bosses can't be picked in the random boss pool. (Fixed)
- Special enemies don't give exp to the player. (Fixed)
- The gate crystal modifier fails to work properly. (Fixed)

Improvement

- Normal and special enemy game sprite redrawn.
- Purple shroom enemies only play 1 shooting sound effect.

Change and Balance

- The gate crystal modifier will give random chips when the player passes 1 wave in endless mode.
- 'Dusk sword' base size increase.
- 'Sword of light' fusion materials requirement change from 3 to 2. Now just need 'Dusk sword' and 'Guardian sword'.
- Adjusting some bosses in endless mode.