The map loops round! Surely one should lose or be penalised when a monster gets to the end of the map? Instead, they just keep going round, including with the damage they have,
The idea of Tower Defence is that one must defend from the incoming hordes. This is just a meatgrinder.
Knowing I don't have to kill the monsters removes the peril from the game.
It also means one can use the monster's Speed enhancements at no risk.
I think this is a bug.
Instead, either the game should end, or there be a serious financial penalty, when a monster gets to the end of the path.