Played Invasion: ESU. It has a nice look to it, feels like a university campus within a city. Good job on the styling.
I would have one comment though: instead of using a kill-box to keep players inside the campus, maybe use a barrier wall. The end result is the same (players can't leave) but it just would look a bit better to have the player bump up against an invisible wall, rather than get destroyed.
Oh, another suggestion, if I may: for your starting challenge, perhaps use a locator and have a player start there (on the ground), rather than have them magically teleport up to the challenge maker starting point on top of the building. Again, not a big deal, just a bit of polish.
Overall a nice toy box. It's good to see character-specific toy boxes. I would've loved to see what you came up with in regards to the INteriors.