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2 level hard i think(when you must use ability to complete level) but remain parts of game is good.

if i add 3d sound you cant hear sound if you far away but i thinked that players is more interested in reading dialogues(i write in note that 3 killers must kill his friend but however, there were only two of them :D )

Can i make dialogues more readeble or more interesting?

I see, 

For dialogues I'd say what I told you previously, just make the text appear a bit faster. It would give more dynamism to text I think. 
Also maybe you can change the color of the important information so that it's more catchy and people would remember better. (like the three killer thing i didn't remember ahah)   

Ok thanks