Looks like the control for dropping food is actually the spacebar and not F! I didn't find any interaction with anything so I'm not sure about E either. Waterbear is cute, I'd like to see more. 🙂
Omg thank you for telling us about that, I did mean to put spacebar! E is used to interact with the tardigrade to bring up the pet UI! I'm working on adding better indicators in the future. Thanks for commenting!