I'm having trouble with my gameboy zero... And if someone here would help me, this would be really awesome

So, I bought a "ready to build" kit for game boy zero.
Shell, PCB, buttons.
The screen is working, the Rpi zero.
When i switch it on, everything boot, but I can't have controls...
I'm using recalbox, and solder the wires on the rpi zero (all gpio) and i don't know what i did wrong ?
Did i missed something here ? Should you modify something on the config file ?
I really don't get it... Because if, let's say, just the up button would not work, I would suspect a bad soldering, but here, NOTHING works. Not buttons, no left, right, ABXY, no buttons...
This could be stupid, but I think I checked everywere and didn't found anything...
Also, I'm sorry for my english, I'm french

