Updated bloodsucker and boss health bars

[b]Update[/b] [img]{STEAM_CLAN_IMAGE}/42161504/418a96d79cc7e6ec363bf141fb5b71e933f3d8cc.png[/img] 1. Update the shape of the boss. 2. Adjust the size of the blood bar. 3. Adjust the blood bar to a three-stage blood bar. [b]Next step[/b] 1. Add more monsters, such as bats and spiders.