Hi again,
If you’re re-using the same objects… but simply adding physics bodies to them when the level starts, and removing physics bodies after they collide with “border”… then your memory usage should remain approximately level.
Really, the main reason to “worry” would be if your memory usage continues going up and up and up, and never falls back down to a normal level. That would mean you have a memory leak somewhere and it would be wise to locate and fix it.
Brent