My first thought would be that I adore how this seems like a... roguelite where we seem to possess all of our abilities but we "unlock" them by learning to deal with dying and clearing each floor with godspeed.  I only made it to the room with the bats and three shooters; playing with right paw on arrows and left paw doing the attacks feels wonky, but I'm also a bit groggy this morning so it may just be me.  

I will play this again and attempt to figure out the "darkest secret."  I think we can light the torches.  Definitely give Cube Logic a shot, guys!  <3