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I liked it! There is a problem that some xp appear in places that you can't reach.

Yeah, sorry about that. I had no idea how to make the point spawn randomly in a specified polygonal area, so I just let them spawn randomly in a rectangle bound. The downside is that they tend to appear in a wall sometimes. Will upload a fix once the jam's over.

Try to make some rectangular areas. Randomly select an area relative to the total area.