Please fix the crashing and the screen

Hello. So this app has some issues which I dont quite like...

Number one: Every time I play on my iPhone the screen will go grey. My friend told me that you are able to build if you wait ten minutes or so, and then the screen will go normal. I have waited for about eight minutes before giving up.

Number two: When I play on my iPad, it works almost the same as it used to, except it deleted ALL of my worlds. I worked hard on the worlds and I wish they would show up in where Ive built them. The screen doesnt go grey but every time I open a world about ten seconds after I do, it crashes.

Thank you for reading this, I hope you find a way to fix these problems.

Meandk0610 about Blocksworld HD