Enlarged gameplay space - over twice as much playable area
Made the lava pit work right
Got rid of the cows (gone but not forgotten)
I've now used tophattwaffle's VIDE tool to properly pack assets - this means no more missing textures and models!
Included navmesh in packed assets - I haven't done any manual tweaking with the navmesh as it is pretty low-priority at this stage. Just hit nav_generate and hoped for the best.