too big app size

I deleted all the unused worlds from my Minecraft app (deleted almost 200 worlds) to clear up space. Now I add up my existing worlds sizes and they sum up to an approximate 200 MB. But the Minecraft app in my ipad keeps 1.75GB of storage!!

I keep searching the forums and all over the net to find a solution for this very large app size. I dont want to uninstall the game and loose the worlds that I filtered and kept.

This issue should be a problem for not just me but everyone, I dont know why I couldnt find any solution for that, please help me out