It moves the sprite around with the dpad.
Put @'s before the GLOOP's, replace the underscore with a space, and change the periods to commas to fix it.
...though you should not use labels for looping. Better code is:
ACLS
SPSET 0,256,208
X=0:Y=0
WHILE TRUE
SPOFS 0,X,Y,-10
B=BUTTON()
STICK OUT SX,SY:SY=-SY
UP=0:DOWN=0:LEFT=0:RIGHT=0
IF SX>0.1 THEN RIGHT=1
IF SX<0.1 THEN LEFT=1
1そうだね プレイ済み