Coronavirus invasion v0.992 released

Sales:
Alpha Lyrae Discovery is now 30% off from 2/5 to 2/18.
Main:
1. New enemy: Coronavirus, it will spread to 3 sub units while dead.
2. New wild object: hive, spider web
Rule:
1. To destroy wild objects will make enemy trace and attack player.
2. Spiders and bees will make web/hive if there were not killed in time.
3. Monsters will switch attack target if they are attacked.