Deadly Drinks

Welcome to your bar, in the middle of the void...

You can put poison in drinks, customers won't know. You can also heal them, but it's up to you. Who will you end up being? Surely not a hero, they don't plan on poisoning people, do they?

This was made in around five days. 

Music:  https://www.youtube.com/channel/UC0R2njnemjabXDt06nupwYA