on line 82 change: CPX #$10 to CPX #$20 this will load 8 sprites instead of 4
and on lines 290-297 remove all 4 sprite lines, and put:
.db $20, $00, $00, $80 .db $20, $01, $00, $88 .db $28, $02, $00, $80 .db $28, $03, $00, $88 .db $30, $04, $00, $80 .db $30, $05, $00, $88 .db $38, $06, $00, $80 .db $38, $07, $00, $88