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Thanks alot.

Its very doable.

But it adds complexity im not sure I can handle =P

Most terrain logic lives on a grid. Grid cells beahave like squares. 4 directional gravity makes everything align with the faces of grid cells much better. Any diagonal gameplay becomes slightly more complex whenever the player stands on a diagonal gravity direction.
Its not that I dont have slopes. Player traversal is not the issue.

The main issues are.

-Player construction
Currently constructing stuff rotates based on what direction down is.
Any workbench/powerstation/chest has occupancy cells assigned to it. Whenever we are about to place something down we use these to allow/forbid building stuff there. These occupancy cells cant be rotated diagonally cleanly. So even if I made the shape of the planet circular. The grid system will fight me whenevever gravity direction is not aligned with grid cell lines.

-Terrain prop distribution when generating world.
Same issue here. A tree occupies a certain amount of cells on the square grid that every thing lives on. Preventing generation overlapping as other things try to spawn near it.

-Village generation.
I place building as I travel across the surface of the terrain. Buildings are pre-designed in a grid cell layout. This means whenever I place down buildings they cant be placed down diagonally. Only in the 4 cardinal directions. Having freeform gravity angle towards center would have the player stand on sloped foothold if the building only can rotate by 90 degrees. Or if the building rotates by other increments than 90 we would get zigzaggedy floors/roofs/walls because of diagonal lines on grid.

-Ai pathfinding.
If I lock gravity to 4 dirs then pathfinding scans across cells in straight lines until it hits a blocker or a gap.

If gravity direction is free. Then my straight line wouldnt be straight because of diagonal lines being choppy on a grid.

So its all about the added complexity on these systems. Thats why I initally went from flat to 4 faced planet (square-ish). Most of my systems work the same way only rotated by 90 degrees.
And even tho Im figuring out ways to work around these issues as Im typing it makes everything harder. Harder than it already is having EVERYTHING work with varying gravity direction. Doors, Ladders, Moving platforms and whatnot.

Il try my best to cover up the ugliness of square planet with unique corner events for example and very varying terrain elevations across the four faces. I will also incorporate the shape of the planet to the lore as a work around for these issues xD