Wow, man, this was a short one. I kinda hoped, there is more. Maybe next time instead of focusing on the difficulty levels, you could spend the time on refining the map gen logic, and adding a few more, more and more complicated levels, new monsters, and traps.
Anyway, hit me up, if you want some mentoring. We have a few dev groups in Hungary where a bunch of people could directly help you improve. I'm not a Unity guy, but there are plenty of others in our community who are.