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I'd love a 3d version of this

I think "3D" and "1-2 month project" are incompatible. 3D is a big mess to do anything, whereas it's easy to blit some sprites.

Yup. Collider/mesh math is where the really esoteric, fun-killing bugs start to be introduced. 3D is cool, but on another level (hehe, literally).

Just use spheres