Major technical update which makes units collide with each other, so they can no longer walk through each other cleanly. The units themselves are not super large so they can still slide past quite often if the numbers are small. With bigger numbers you can see more pushing happening.

Other changes:

* units now fully heal if they change sides

* main enemies are now red instead of purple

* mushrooms are now teal instead of red to not get mixed up with red enemies

* corpses remain visible 2x longer

* many mid-game waves are stronger and more varied

* Reward re-rolls are now gained once every 3 levels instead of every level. You can still spend them whenever you want, there's just less of them available over long run.