I also did some test runs now in the sewers with the new changes and the memory usage dosen't increases after every fight now. So this should be fixed. Enemies won't get erased now then fighting with them, they only get pushed away, meaning tehy can be refighted as many times as you want. That's the solution I came up with.
Since I need to do a lot of rewriting to make that work for all area's I think the early acces version will be pushed back to next month so I can take care of that first.