Very kind of you to say. I found a link on opengameart to http://www.nosoapradio.us/, the guy has hundreds of music tracks that are free to download that have an attribution license. A lucky find tbh!
Its a good point about the respawn, I should probably move the collider a bit higher so there's not such a big drop. I put it in at the start when I didn't know how far down the level was going to go tbh!
All changes in the levels were random, except in the last level where the whole section rotates to drop you.
I have to admit, when testing the levels there were a few times that I had to go again because the level shifted at the end, so I certainly understand your pain. It was worse originally tbh, the level moved at a faster rate. I slowed it down after the level with the pipe shifted while I was in there and fired me about a hundred meters into the air (though it was funny). In hindsight maybe I should have had difficulty options that increase the amounts and speed of the shifting!
Glad you enjoyed it :)