Very cool little roguelike! There wasn't really enough variety to keep me playing for too long though; furthest I got was room 14. As near as I could tell, there didn't seem to be any point to the "30 days" in the UI. Was that a planned feature that didn't make it in?
btw, the fullscreen button doesn't seem to actually make the game bigger, it just puts it in the upper-left corner of a blank screen.