mm 80 objects are definitely nothing to worry even if it's Run Every Tick doing things like just move etc.... My guess is like Kyatric says its something with the phone that is not supported.
Or
Another important place to look with only 80 objects though is the behaviours you are using
Example:
You may have a Pathfinder behaviour and all the 80 objects are trying to find a Path every tick making the Game lug and stuttering.
Definitely, you should make a Demo and share it, most likely it will get solved pretty quick unless is the phones fault which then nothing you could do.
Another thing you could try is to disable the "Worker Mode" and then export and see if it helps