One thing I forgot to mention. What had been good had been to give maybe random tips between those floors or before starting the game or on title screen or something. Main point being that it took me a long time before i realised i was losing health from wrong keyboard strokes.
At beginning this even worked exactly wrong way around, for i noticed i had lost some strength, and i thought it was so that you lose some strength the longer you stay with enemy and on top of that from hits, hence i started to try type even faster and with too slow a machine, even more miss strokes came. I eventually went all the way to easy level to be able to survive, until i realised problem was miss strokes, after which i was able to play even with hard level as long as i put the graphics settings low enough, as i wasnt so much in hurry to type than i thought, but was more of in need of being more accurate with my keypresses.