It seems there is the option to remove an upgrade with the x button. Better remove that (and just let the whole thing be clicked for removal.) or maybe different visual (the white/red x button is ugly).
Why not not give the stuff which has no depth per se, a "virtual" depth. Like hud gets 0, the stuff of the player itself gets 1, and world gets 2 .. skybox 3?
The bug would still happen on world surfaces, but it would be less noticeable.
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Yes would be nice, I can imagine, that you would need to press c (the map overview key), and then u would be able to click on it. Else I don't see how to decouple the mouse from freelook - in a intuitive way.
