This was an incredibly addictive game, I really loved it despite some of the levels being infuriatingly difficult (I'm looking at you, level 34...) :D
I noticed a bit of an issue with the level numbering starting around level 42, but I think others have already pointed that out. If you're interested, I played the entire game though on stream (though I didn't get 3 stars on all levels) - it starts around 2 hours 30 mins in: https://www.twitch.tv/videos/1102780828