You can get the savefile using a file explorer, and get them here: /Android/data/com.GrizzlyGamer.RMAWhellcum
You'll find:
config.rma
SavesInfos.rma
and one or several SaveX.rma (where X is 0,1 or 2)
You can try copy them elsewhere and restore them later, but we don't know if that will work for sure.