Pretty hard to rate or offer feedback on, since there is so little there. But hey, congrats on getting something submitted nonetheless; there's been times where I just end up with nothing to submit to jams at all, so you've done more than I sometimes can!
What there already is in the prototype, along with the mockups of rooms not in the game do have nice artwork and a cool vibe that I'd be interested in seeing more of.
On the other hand, embrace the whole "1st room and you can only die" angle and market it as a nihilist manifesto.