Sing-song

VI to i chords are generally considered a little bit odd in functional harmony (until the end of the Renaissance era), without any sort of dominant backup.
I have no idea what happened around 1:15; if they're wrong notes, or you wanted a double layered major minor dominant chord, but it was a mess.
The repetition of rhythmic is good, but might be too much; you only really give 16 bars of actual differing chordal harmony until the end which is a shame.
It's fine, but arcs don't always need that long to build. It sounds like a good introduction to something else.

At 1:15 it was a mistake   I`ll try to use this as an introduction to a bigger piece as you suggested. Thanks 

This melody (I know it's a coincidence) is very similar to a Spanish pop song from the 70's (por el amor de una mujer, Miguel Gallardo).