Super great! I didn't even realize their were little butterfly collectibles for each level until after I beat all 6 levels so I went back and did em all again to get em. My only disappointment was that there was no secret ending or unlockable for collecting them, but it's still a complete game in my opinion. Definitely a little "attaboy" for collecting them at the end would go such a long way. Great job! Attaboy!