Here is the titlescreen compressed by ZCP. 25% isn't a bad start. You can get even higher percentages by strategically placing horizontal patterns in the image. Regular RLE might do better, because ZCP only seems to want to compress 'runs' of $00s and $FFs. But seriously, 191 bytes is nothing to sneeze at, and since the decompression routine only takes 81 bytes (plus 9 bytes per call), you've already made up for it's size twofold!
Code:
; temp.zcp
; Compression = 25%; Saved = 191 bytes
.db $76,$80,$65,$87,$69,$80,$F0,$BF,$53,$8F,$DD,$65,$0A,$E2,$83,$54,$BB,$EE
.db $64,$09,$F3,$A1,$57,$BB,$E1,$62,$0A,$C7,$D1,$58,$BB,$EF,$62,$0A,$C7,$D1
.db $58,$AB,$EF,$60,$0B,$CF,$E9,$59,$B7,$EF,$5E,$0C,$CF,$F5,$5B,$97,$63,$0F
.db $48,$BF,$7F,$E0,$0C,$FF,$BF,$7F,$E0,$81,$F0,$FD,$CF,$5E,$BF,$58,$0C,$C0
.db $08,$C2,$BF,$4F,$BB,$EF,$59,$0C,$C0,$08,$E1,$8F,$50,$BB,$EF,$58,$A0,$0B
.db $E0,$8C,$90,$53,$BB,$EF,$56,$98,$0C,$C8,$86,$88,$9F,$4D,$BB,$EF,$55,$B2
.db $0B,$E1,$80,$C2,$83,$4F,$BB,$EF,$54,$A9,$0C,$E1,$80,$C2,$83,$4F,$BB,$E0
.db $53,$A8,$A0,$82,$81,$81,$84,$83,$4F,$8F,$58,$A4,$C8,$81,$80,$C0,$C2,$80
.db $6E,$A2,$E0,$81,$08,$C0,$C2,$80,$6D,$A1,$A8,$80,$C0,$90,$90,$48,$BF,$53
.db $8F,$4C,$A0,$D2,$80,$C2,$88,$88,$BF,$52,$83,$EE,$4E,$A0,$A9,$80,$C3,$C4
.db $84,$9F,$8B,$4E,$BF,$BB,$4B,$A0,$94,$A4,$A1,$E2,$82,$8C,$84,$4F,$BF,$83
.db $4A,$A2,$CA,$92,$90,$F1,$82,$83,$95,$9F,$49,$BF,$BB,$4A,$A1,$8A,$8D,$A0
.db $F2,$84,$80,$C8,$CF,$49,$BF,$BB,$49,$A1,$A6,$C7,$F0,$B9,$84,$C0,$9A,$97
.db $4A,$BF,$BB,$49,$A1,$A6,$C7,$F0,$B9,$84,$C0,$9A,$97,$48,$83,$51,$A0,$83
.db $A3,$F0,$9C,$C2,$C0,$88,$89,$61,$A0,$85,$91,$C0,$89,$81,$0B,$C0,$DF,$5C
.db $A0,$84,$E8,$14,$D2,$81,$80,$DF,$4D,$BB,$FF,$A0,$89,$F4,$13,$CA,$80,$C0
.db $AF,$FC,$8F,$BB,$FE,$A0,$8B,$F4,$0F,$F4,$A0,$84,$82,$BF,$FB,$FB,$DF,$F4
.db $81,$9F,$FC,$0D,$C8,$C0,$88,$82,$4A,$BF,$D7,$FC,$C0,$A7,$4A,$0D,$C7,$A0
.db $8C,$82,$BF,$F7,$FD,$48,$A0,$8B,$4B,$0D,$C2,$CC,$86,$80,$DF,$FB,$FE,$49
.db $A0,$8B,$4A,$0C,$E0,$D1,$81,$C0,$97,$FE,$48,$BF,$F4,$81,$BF,$FE,$0B,$E0
.db $D1,$81,$C0,$97,$FE,$52,$A0,$93,$48,$14,$D8,$C0,$D0,$8B,$5A,$A0,$97,$49
.db $12,$DE,$A0,$A8,$85,$5A,$A0,$93,$4D,$0C,$F0,$E2,$8F,$C0,$AF,$56,$A0,$97
.db $50,$80,$F8,$88,$E7,$D0,$8B,$58,$A5,$97,$59,$09,$C7,$DA,$A9,$BF,$54,$A2
.db $97,$56,$0C,$C0,$9A,$91,$BF,$53,$A2,$D3,$4F,$15,$F1,$F2,$D1,$BF,$52,$A0
.db $97,$4C,$B0,$11,$CF,$FA,$81,$BF,$52,$A0,$97,$4B,$90,$0D,$C4,$9F,$E8,$85
.db $7F,$7F,$7F,$65,$83,$FE,$8F,$E1,$E3,$C7,$F0,$9F,$67,$80,$FE,$83,$F0,$F1
.db $E3,$F0,$87,$68,$08,$F8,$83,$E0,$E3,$C7,$C0,$87,$66,$09,$F0,$E1,$E0,$E3
.db $C7,$87,$C7,$66,$87,$FC,$BC,$B8,$98,$F1,$E3,$6F,$83,$FC,$BC,$B8,$88,$F1
.db $E3,$70,$81,$F8,$F8,$F0,$91,$E3,$C7,$71,$83,$E3,$E3,$C0,$87,$8E,$9F,$70
.db $83,$C7,$C7,$88,$8E,$9C,$BF,$6F,$83,$C3,$87,$88,$8E,$9C,$9E,$9F,$68,$83
.db $C3,$87,$88,$8E,$9C,$9E,$9F,$64,$09,$F8,$83,$E3,$83,$C7,$C0,$87,$66,$08
.db $FE,$83,$F1,$C1,$E3,$F0,$87,$68,$81,$FF,$87,$F1,$F1,$E3,$F8,$8F,$7F,$73
.db $00
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Sonic => Your Projects
I did see that little Sonic "demo" you had.
Now: 956 bytes, I saved 15 bytes!
if you wanna make it more "sonic" like than I'll just put that in there.