For a first game jam this is really good! The art was cute and the music was fairly catchy. Definitely had some bugs, I accidentally deleted the double gem (II think, what you got from crafting two crab drops together) the first playthrough, and walking back to the room with the black box locked the doors behind me again and I couldn't get past there without restarting.
Adding some variation to the scenery would really add to the game, as the grass and trees feel very repetitive. Maybe also consider some scene transitions and effects.
Overall though, very nice and very fun. I enjoyed it :)