Actually, this isn't isometric nor planometric. It's oblique projection. 

 ´Verry good

 I Like it 

 Sonic !! =D

  I like it !!

New version with bigger edges.

loving it, i like the way its done in this picture

Wrong link ;)

Ok, now I'm very busy so maybe this week I can do a edit.

well since you're no longer restricted to a certain size, if you wanted the image to feel more comfortable, you could always enlarge the canvas. up to you

Ok that's fine. The size is this one because it was made for a challange in pixelaria.

actually this is planometric. isometric is the 1x2 lines, you've got straight lines and 45 degrees lines. regardless, not a bad piece, but sonice needs some room to breathe, it creates unintended tension when his outline touches the border of the image.

Você é teimoso de mais, isso não é isométria para mim

Of Course it can. Take a look at the angles and the perspective.

 Can this still be considered isometric? O_O

I'm not trying to insult you; it's a pretty solid piece. I'm just not sure if this is actually isometric.