Hey, thanks a lot for playing!
There's only 2 orange floors and then a dev room with a "thanks for playing" message.
I think the main reason it gets so hard when you reach those floors is that my difficulty scaling system assumes you'll have a whole extra floor of EXP and gold from the floor the guardian is on, so it's a level harder than it should be. A minor rebalance on that front is coming in 0.1.1, and then I plan bigger changes to progression in a later update.