It's intended to target the attack target, and it's intended to place the point of origin at self. We know this from official rulings that have been shared already.
Regardless of what the developer may or may not have intended with this spell, it is not possible to do what you've just said above. The reason is simple:
Range
The target of a spell must be within the spell's range.
If you were referring to the latest point about the developer comments, I assure you it's not a question of misunderstanding. I've given you the correct answer on the matter. The target of a spell must be within the spell's range regardless of what a developer may or may not have intended.
Why not debate whether you can make an Opportunity Attack on YOUR OWN TURN?
Because the rules are unambiguous on that. It has always been possible to make opportunity attacks (or take other reactions) on your own turn. There has never been a rule against that.
Regardless of what the developer may or may not have intended with this spell, it is not possible to do what you've just said above. The reason is simple:
I'm sorry you don't understand my point, but we've spent enough time on this. I'm going to agree to disagree and leave it at that.
If you were referring to the latest point about the developer comments, I assure you it's not a question of misunderstanding. I've given you the correct answer on the matter. The target of a spell must be within the spell's range regardless of what a developer may or may not have intended.
Wait? Why did everyone debate Booming Blade?
Why not debate whether you can make an Opportunity Attack on YOUR OWN TURN?
Because nothing prevent you from taking a Reaction on your turn.
Because the rules are unambiguous on that. It has always been possible to make opportunity attacks (or take other reactions) on your own turn. There has never been a rule against that.
From the PHB
It seems quite clear you can make one on your turn.