I gave this a go but for some reason the interact key isnt working, due to this im not going to give it a rating but if you could get back to me telling me if its something im doing wrong i would be happy to give it another go.
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When you are standing on something you can interact with an E icon shows up above your head.
Things like the table in the top right of the starting room require catnip seeds to interact with, the people in the main street require catnip to interact with and you need 25 bucks to interact with the person in the seedz store