This time, I didn't use drums cause I think they wouldn't fit the song. What do you think?

Nice ditty here. Has a kinda 60s feeling to me.  And you´re right about doing without drums.
I noticed that the harmony voice is a bit too low in parts (especially when it starts ). Is hardly defineable and sounds more like humming. Perhaps you can mix up the harmonies a lil louder and hence make it clearer.  

U.L.I.

Nice warm sound, heart felt vocals. It's nice how it builds.

The backing vocals are a bit too soft at the first entry as ULI mentioned, but OK  when sung in a higher key, would sound better if you panned them closer to the lead vocal, just enough to give it separation.  I gave a tip to someone recently on how to create a simple stereo technique called the 'haas eefect', which I would use for the main rhythm guitar, it will give you vocals the center of attention (there are many YouTube tutorials, it's easy to do).  You could also try less reveb for a more intimate sound, particularly on the vocals, but that's my personal preference for songs like this, if you wanted to create a Beatles type feel, then you have succeeded.

Nice song to listen to, thanks for sharing 

I think even this reverb-type gains this nostalgical 60s atmosphere. Less or another reverb would rob of this "beatle-esque" feeling.