I bought the cat food

[Enigmatic Paladin]

I see the box sitting on the belt but I can't interact with it. I can't buy other things because of it.

[lazerkeyboard💀]

you have to remove the tape off the top of the box

[Cybernetic Walrus]

Indeed pull the tape of the big box. You should be able to grab the cat food and drop it in the yellow highlight were the tin food can is.

[Bambi]

not having any clear way to interact with boxes is a HUGE issue

[Szalage]

Originally posted by Bambi:

not having any clear way to interact with boxes is a HUGE issue

We added clear indication, which will be included in the full game! :)