[prussia]

When I read the title I thought of Befunge (https://en.wikipedia.org/wiki/Befunge). This seems easier to write though :)

[astrange]

There's also the descendents:

https://wiki.c2.com/?PathLanguage

https://esolangs.org/wiki/SNUSP

[Izkata]

Also "Piet", an image-based one: https://www.dangermouse.net/esoteric/piet/samples.html

(No idea if it's related to these other three)

[lifthrasiir]

To be fair SPL is not two-dimensional, a grid is just a way to represent one-dimensional source code with indentations :-)

[thecodedmessage]

So what’s the point?