Hey there!

It sounds like you would be changing enough of your existing game for it to be allowed, as per rule 3: 

• You are free to reuse any assets that you have made in the past, or use freeware or commercially available assets. This includes music, sound effects, models, et cetera. We only ask that you do not begin collecting or creating any assets specific to your AdventureJam entry until the jam begins! (If using freeware or commercially available assets, please credit the original creators.)
  

Glad to hear that you're interested! Hope to see you create something with us! :)

hello on the game jam it will be possible to send APK files