Hi, sorry I took so long to reply.
The Deluxe version is based on SHOOTOUT Inc's engine (the full game based on SUPERHOTline Miami I'm working on), which is a heavily upgraded version of the one used in SUPERHOTline Miami. But this new version of the engine doesn't have custom level support sadly.
But one thing I can do, is re-activate the downloads for the old version which has custom level support.