longest game so far

hi, this is my 3th post here and i will talk about my second game. it is not ended yet, but it is in its ending part. blacks have one more tower and i have one more little guy with a free column although in the beginning of it. i'm in a bad position, but what i want to show you is not the end of the game but move 15.

 i would like to ask what you think of this move. i give the horse for a position i couldnt see if i could take anything good from it.

i ask why i made this move 5.Be3, its not even contempled in chessbook.net 

looking to the book it looks that 5.exd5 should be a better move. Well...