Hi @JorgeDavid!
It is indeed a very good and enjoyable piece!
I really like its simplicity and childish mood, maybe is it too short? I think that a longer version of this piece would be even more gratificant!
I really like the VII7/V in b.4, as most of us would expect a D# not an C! Also, I wouldn't do the rit. at b.4, it is yet too early for that, a quaver union between b4 and b5 would be great.
I think that the Am section is maybe too short, just 4 bars. As Henry said, this types of textures get boring easily, a more complex bass line in B section (or some kind of counterpoint) will help to keep it interesting through all the piece.
Hope I helped!
Samuel