Questions in Game Dev

See the problem is that I want to release this game somewhat completed. I haven't done anything like that, BioFuse suffered from it. The next problem is that I already have a devlog page made for it but I want to know if I should keep my secrecy.
So, almost a draw about the game music, what if I create an options menu and you choose in-game what you prefer?
I have a question, what do you prefer:
One music per level or random music like a radio?
Which style of game do you think is cooler?
Gameboy or NES?
Hey so I wanted to ask if anyone had any tips on making a hiding system(going in and out of an object) in unity for a first person pov game. Im using playmaker for some things but can also do a little coding. If anyone could help it'd be appreciated alot.