Here are some small and not difficult to do suggestions:
1. Change the icon for the JK Battle Royale depth from a pink castle to a pink skull.
2. Show the health bars of monsters (with an option to turn it off of course)
3. Show a giant health bars of bosses so we have an idea of where we are at (again with an option to turn it off)
4. Show us the number of crowns we earn after each depth and after the whole journey
5. Show us the overall resistance that we have, for example show us the total freeze and piercing resistance we have when you combine Wolver Coat/Cap with a Jelly Band(has a resistance against piercing damage) and a Hearthstone Pendant(it has a resistance against freeze).
6. Make there an option to keep Full Inspect on after re-logging in so we don't have to it everytime we log in.
There cool ideas but the health bars of monsters would maek it too easy. You could(i guess) buy something from the booster stranger that would ALLOW you to see the health of bosses and how much health you need to take off. All these idea's are great ideas!