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Since this is the sky, let the clouds and floating islands move around. And those standing on them should also move, or even be able to fall. Here's another idea: the weather changes at different altitudes – there could be a storm, a hurricane, etc. If you land on a tile with weather, there should be some kind of penalty.
The islands shouldn't move. Where have you seen moving objects at ground level? It might seem interesting and unusual, but it will become boring over time. The penalty idea is good, though.
Well, if we're talking about the weather, it should be terribly cold up there, and you should have to wear oxygen masks.
Of course, it should be cold and there should be a lack of oxygen, but this is a game, so anything is possible.