i was/am having the same issues with several of the abilities that you seem to be having. it's tough to gauge where real world implications will hinder the powerset. i toyed briefly with gravity powers as well. i plan on just (probably) throwing something together--based on my understanding of the rules--outlining how i'd wipe you all out and see what happens from there. i think certain allowances will have to be made, but some powers require more allowances and assumptions than others. those were some of the issues i mentioned in a different post but...i didn't really want to get too into it because it's sort of just a fun thing.
imo, MAYBE a better than a single post would be a 3 post limit/player in one new thread. people can make alliances if they want then plan accordingly and it would give a chance to rebut someone's plan. ike a battle royal bz. lol i don't really know though tbh....