I combined "top-down" events and playertypes to create this.
https://www.youtube.com/watch?v=ohvkCKU-w-o&feature=youtu.beEDIT: Here's what you need to do this,
http://orbs.daprogs.com/rtb/forum.returntoblockland.com/dlm/viewFilefd97.html?id=5083http://orbs.daprogs.com/rtb/forum.returntoblockland.com/dlm/viewFilef038.html?id=787Install them both and then follow these steps,
Plant any brick of your desire
Now use your wrench to get to the events window and select "onPlayerTouch."
Select Client...
set2DCamera...
This part is your personal preference, but I recommend using 90 for the first box and then 25 for the second.
Depending on what numbers you put in you should be in a top-down view.
We aren't done yet, we need to lock the camera so you can't look up or down. This is why we got the playertype.
Start a minigame and select any of the 2D players and click "Create"
Walking on top of the brick again would have you in the same view as last time, but you can no longer up and down. If this is the case, you did everything correctly. Get some guns, friends, and a map and you're in for some fun!
This is not tested for multiplayer functionality, results may vary in fun-factor