I have an identical problem. I'm trying to get the rocket and they have everything except 1 oil drum sitting on the shoreline of another island not far away. I have removed all trees from the island and moved minerals to another island to get them to leave the island but nothing yet, I will post again if this works.
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If you use WASD F-attack Space-Jump and Arrow keys R shift-jump R enter-attack you can play against yourself. I figured this out because no one would play with me anymore after I beat them too much. Tip:Don't beat your one friend too often at a game. he'll stop playing with you.