Yeah it works. The Minimap let BlockLauncher crash sometimes when traveling to the nether and back. If that happens to you re-enter the world and don't open the minimap until you are jumped through the portal.
That is definitely not a crash due to 0.12.1, line 72 is inside the check for update function. It seems that the url returned some weird things.
If it still crashes you could manually disable the update check. To do so open the file games/com.mojang/minecraftpe/mods/minimap.txt and change the line updateCheck:1 to updateCheck:0 Does it work now?
Wow that would be awesome! Best would be a way to keep the mob looking-direction info even when using the head icons. Maybe rotate them?
I simply rotated the head icons but that looked odd because it is not obvious which direction is forward. Next I will try to add an arrow like shape beside the head that points to the forward direction.