Hey that is a great looking Lego replica. Everything looks very funny and though serious, that's a serious upgrade property for a real artist.
The only thing are the buttons: You did a good job, but I'd add some coverage on top of them.
I'm giving this a 3/5 mini-fig heads for several reasons. My first and foremost complaint is that the screen is not raised and is not completely square. Maybe if you some how used tiles to make it level with everything else it would be good. Second the buttons. If they were raised and if you used studs for the A, B, START,Brightness, and SELECT buttons and have the arrow pads raised. Finally, the cartridge. It doesn't fit in perfectly like the actual SP. It is hard to make it so, so I'm not going to be as harsh with that. Anyway I like the power switch, how you made the cartridge design, and how it opens up. Still a good (that's 3/5!) MOC from you! Maybe when the mocathalon is over you can make a V.2!
Arghhh...! Ich wollte gerade meine Version des GB Sp posten, aber jetzt bau ich doch lieber was neues! Klasse Moc, die Details sind echt wunderbar, meine Umsetzung war lange nicht so gut. Besoders gut finde ich die Klappfunktion!