Why...
I found it annoying not being able to separate troops. There's very little strategy in that regard, also, I think you should be able to move units 5 spaces per turn, not 5 or less spaces once per turn.
My biggest complaint though is that periodically, all of my troops would simultaneously explode and I would be informed I lost. There was no explanation for this, and enemy troops got nowhere near mine after 4 turns.