The game let me bury the glove and the bucket, but not the fish -- the one thing you're actually supposed to bury. I also cannot trigger the hint from the whale about burying it I saw in the playthrough in the comments.
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I assume (based on your other reply) that you're playing the web version. I haven't been able to replicate this... it sounds like the game was somehow interpreting you trying to use the fish (with X or O) as trying to interact with the world normally (with Z or I). I haven't heard of this happening to anybody else so far, so I would think that it's an incidental glitch that could potentially be fixed by refreshing and restarting the game. I have it logged and will keep an eye out for anybody else reporting the same problem. Sorry about that...
Thanks. Unfortunately, I'm going to have to restart from the beginning. Hopefully I'll be lucky and miss the glitch this time. If this helps, I think I had to burry the boxing glove, the bucket and the brick in order to get the fish to the front of the queue -- maybe I missed, but there seems to be no other way to cycle the objects.
You can cycle through the items you have by holding the X or O keys (which brings up an item menu over your character's head) and pressing A/D or left/right; the controls are a little unusual, but we didn't have a lot of time to refine them within the deadline. Here's hoping everything goes smoothly 🙌