The upgrade ladder ends too quickly, and you're left grinding and waiting until the end. Otheriwse very fun. Must be the tastiest mutton in the universe...
Bad features: 1) If you throw your weapon onto a box then break the box with your fists you can't get your weapon back. 2) If you go up the ladder you can't go back down it.
To activate a shrine (for you botd junkies): 1. Beat the first map. 2. Choose map #3 (on the right) 3. When enemies are on screen, put a gem on the shrine (the tower with the V on it). Shrine is activated! 4. Beat the map. This will actually require some thought/walkthrough, but is required for botd to count.