I just gave it a test in the web version and it seemed to work fine, make sure you're clicking on the items in the barn menu rather than on the barn itself or the items in your inventory!
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Ok so I went back to the game after your tips and I ended up enjoying it! It is a very well polished game with a cool gameplay loop. My issue with the game is the controls. It is strange having to use both clicking and the spacebar to interact with things. It is unintuitive and I often kept pressing the wrong buttons, and I once accidentally shot my cow while trying to get milk. I feel like all of the interactions should either be controlled with either the mouse or the space bar, having a mix of both made it really hard to get into a rhythm