There was one level, a snow-themed level, which used the piece Frost Waltz by Kevin MacLeod. Due to the nature of his music, the piece has been featured in hundreds, if not thousands of games. Every time I've heard that song since, I always think of that level from that game.
I specifically recall this being one of the first pieces I heard when music was added to KSP, and experiencing the same sensation then, thus dating the game to 2012 Sep 19 or earlier. Because of the publishing of the song, the game must have been released 2008 Nov 21 or later. It is quite likely I first played the game on ArmorGames, but it is probably also on Newgrounds.
An exhaustive survey of every game published on AG using the Wayback Machine has excluded an AG release before 2009 Nov 10.
An exhaustive survey of every game published on AG using the Wayback Machine has found the game! I have now added it to the recommended games list - it's a real treat, and I highly recommend it! You can see a playthrough of the level in question here. You can also listen to an interview with the creator at Van Hemlock. In 2010 the developer went on to develop Unnatural Selection, and was working on three games called Fireflight, Sentinel, and Two. In 2011 he released Rocketstorm for BlackBerry. In 2012 he stopped posting on his blog Lack of Banjos, which later ceased to exist in 2014. This seems to be the end of our story.
Format: exe