Ok so i've been thinking that it could be a game when you get bored. Could be done at any level. The objective is to "push" one (2 or more optional) into a "goal". Example: first level of Royal Jelly Palace has stairs leading to a room where you need to push two buttons to spawn mobs. Kill all the monsters (optional to leave 2 or more alive) and shield bump them to the players "goal". Also make the "play area" clean (to not kill the mob). Post what you think about this.
This is not a suggestion. Just something to do.
Me and my friend have shield bumped a Lichen Colony between us trying to kill each other. That was fun. ^^