Update Alpha 0.4.1b

[New]:
- Added 3 new types of healing items through the map and in secret areas.
- Added a bridge connecting the main area and the lighthouse area.

[Bug Fixes]:
- Fixed many player sounds not being assigned to the SFX channel, leading to the SFX slider not working for muting certain sounds
- Fixed certain music pieces not being assigned to the Music .channel, leading to the Music slider not working for muting certain music pieces.