Yes, we were able to find the source of the bug, but the submission time had already passed, so it remains. It occurs whenever the last moving enemy die is destroyed. It is most apparent with the pink dice, as they move significantly farther than the others.
Alas, we weren't able to catch this one before time ran out, but it was the last really pernicious one we could find with the released version. The workaround I can offer you is to try not to kill anything on what will be the last enemy time-step, like killing the pink die late in its path, or it could happen if you're unlucky while killing a die while everything else is on its final movement step.
You can actually rotate the die in the UI on the left to see what the other faces are, but it's not necessarily smooth, or documented in the instructions.
Thanks for your feedback and giving it a try!