love the art and the leaderboard that's really cool made me replay 24 is out of my reach though ^^
I would completely agree with the comment by Amanda Fernandes and especially on the lack of feedback it could be a sound, a color when a item is correctly place in the kettle or a displacement of the item from the kettle to the table when it's place ...
for the "bug" I don't think this game as any bug per say I'm not sure but I think your checking if sprite is in kettle like that
if (minSprite.x > minKettle.x && maxSprite.x < maxKettle.x) same for y or a engine function that does that or your doing perfect pixel hitbox in similar way.
if Im right you should either reduce the sprite hitbox or invert the condition like this
if(maxSprite.x > minKettle.x && minSprite.x < maxKettle.x)
always be kind to the player if he's a bit wrong he should be right.