Out of memory and some lags ?

Hi,
i did a android game, My game running correctly but there are some lags.
I don’t understand why some game have a lot of moving things and my game lag with only one character.
With search and a game report i found that is a memory problem. I use 3.92 MB,this is to much.
I did a memory report but i didn’t found what i have to change to use less memory.

I hope somebody can tell me where i did a big mistake that fills the memory

The memory report of the game

https://play.google.com/store/apps/details?id=com.Wordor.FallAndGrab

Thanks to your answers