Heap is a shithole. It's like a garbage dump of different worlds. Once the technology to create portals becomes wildly available to a civilization, they will naturally start to throw away all their garbage. At first it might just be nuclear waste, plastics that never degrade, that sort of thing. But pretty soon they'll dump their normal litter and garbage away, and then it's only a matter of time before the excess population gets dumped too.
Those with morphs to spit fire or acid have burns along their arm- most put their morph in their non-dominant hand, as to keep their good one for punching or shooting. Ice morphs are cold, of course. Morphs that turn your body into a hive for insects or leeches are very nasty, but very effective in the closed environments where fights break out. Heap is an artificial environment, it's not like people have easy access to bugspray. Some morphs are put into the legs, chest, eyes or other parts of the body. Some people have urban travel morphs- their legs are skinless, bulging with muscle, which must be massaged and bathed in salt every day or else they'll start to cramp and probably sever an artery with how hard they'll spasm. In return for this sacrifice, you'll be able to jump a few stories- right up to your mark's window. Why not? It's not like you have a long life expectancy here anyway, what with the pollution and toxic air.
The idea behind the Morphs and Heap in general came from Bioshock. One of my favorite games. I think this version of a “magic system” is a little better then the psychic stuff from Garden, but that's just a gut feeling, not idea how it actually looks from the outside. I also love the sort of dark and dingy modern life aesthetic seen in a few places, like Paratopic or any Puppet Combo games. I don't really have much else to add here- Heap is a sort of vague idea on my mind and I decided to write it up using my 40 minute setting format. Hope you enjoyed it, there might be other projects involving Heap in the future, it's gripped me in ways that I didn't expect.