Finished Level 17 and it threw me out to the main menu... Levels 18 and 19 had more than 5 differences, but only 5 would register... completed the game and it went to a yellow screen... and once I discovered there was no penalty for wrong clicks any time I got stuck I just randomly clicked all over the picture! Needs work :(
Popped in to make sure I'd completed the game ready for the inevitable badges... found my progress had been wiped! So I played the game all over again, which was nice :)
When I started the game up I wasn't impressed... then I played it... not very difficult but did make me have to think VERY carefully quite a few times about which blocks I could (and couldn't) turn off! Short version: I enjoyed it :)
A tip: fill the level with one colour first. I then found it easier to add the other required colours one at a time, seeing where they would overlap/join themselves. Hope that helps :)
When the game came out I played a couple of levels but didn't like it... then it gets badged so I come back simply to get the badge... this time I actually enjoyed it and updated my rating accordingly! :)
 "The Ruins of Machi Itcza"){kind=icon}
 "Ghost! a shipwreck"){kind=icon}
 "Jungle 5 Diffs"){kind=icon}
 "Dozenbear"){kind=icon}
 "Robert The Elf"){kind=icon}
 "Cuboy Quest 2"){kind=icon}
 "Unproportional"){kind=icon}
 "Cactu-Sama"){kind=icon}
 "A Bonte Christmas"){kind=icon}
 "Wish Upon a Star"){kind=icon}
 "Axiel"){kind=icon}
 "UnpuzzleR"){kind=icon}
 "Four Color Theorem - Coloring Puzzle Game"){kind=icon}
 "Broken TV"){kind=icon}
 "Pumpking"){kind=icon}
 "Unnamed Chick Game"){kind=icon}
 "OnTheWay"){kind=icon}
 "Just Slide"){kind=icon}
 "A Grim Granny"){kind=icon}
Thank you! I know that feeling :)