actually pretty easy, once you've figured out that there's a map. just choose the longest path and you'll end up in the room with the boss. good thing that it isn't buggy (at least i havent encountered any bugs). but it's too short and simple to be really entertaining. the concept is allright, nothing special but allright. just try to develop some kind of story and a more complex weapon-system (like buying/upgrading, etc.) and it could be interesting.