Pedro,
First off, welcome to the forum and hope you enjoyed listening to others music so you can now post yours. Everyone here is always willing to be helpful where we can, as fellow forum members.
As to this song, that kick drum is to loud and up front to much. The guitar could use some warmth added to it. The vocals seem to be O.K. but maybe could use a bit of reverb, chorus or delay, not quit sure. You might try to equal every thing out a bit and the panning IMO could use some adjusting so there is more separation to each track, as some seem to be pretty tight to each other, but that could be just me and my preferences. The over all song is pretty nicely done, but I would loose the first 17 seconds of the song, it just do anything for the song at all, IMO.
That being said, great start to something even better. Just a few tweaks and your there.
Peace and Blessings, John