More testing with pathfinding. Light gray area is walkable terrain, black tiles are obstacles. The blue square is the origin, the red one is the destination. Tiles with numbers are the ones the algorithm had to explore before finding the final path - which is shown in green.

I wanted to have this kind of "debug version", where it shows me the exact numbers for every tile explored. So, now I can test with different models of optimization, and see the detailed effect on how each tile "favourability" is calculated.