itch.io

You have to hit enemies vulnerable points. When enemies attack you, an F key image will appear. If you press 'F', you hit enemy's vulnerable point. When they've got stunned, you can infect decay by pressing 'E'. Things are opposite for boss. You have to wait him to enter healing mode. When he's in healing mode, he heals nearby enemies. You can hit his vulnerable point while he is healing.

Also there's a bug with settings button. Sounds dont stop playing, their volume decreases to 0 instead. You can increase back.