once i make my release, can i still update ...?? --- yes
and if soo, can i update after close time (mach 20 th)?? --- no,you can't update AFTER the compo closed.
could i release a two versions? without neoflash and with neoflash? --- no,you can not,we just accept the version which come with neo splash.
Also could i release no splash after august 20? --- yes,you can.