what in .tar-nation is wrong with your zip file? Just kidding... Though, I also had to do the paul workaround (extracting from within the archive directly). I also checked out the levels and I have 2 words : really great!
I also have a few more words about each level, if you care to hear them. If not, skip the rest of this post.
Level 1 - fun idea. I like the teleporters/gaining speed idea, but I also think you should carry it further. Too small (especially in comparison to all of your others levels!)
Level 2 - Now this was a lot of fun. I felt like I was riding waves - it's a great idea and you've done a good job keeping variety in it as well.
Level 3 - I really like the texturing changes and extra coins. This level is really, really good looking.
Level 4 - Wonderfully challenging, and I like your addition of jump "nodes" (ala basketball level) to get the blue coins. The texturing on this one is really great, too.
Level 5 - You've made a lot of changes on this one since I last played it. I like all of them, except for the big worn-out board/crate lid that you bounce off of... It looks so out of place amid the fancy, shiny textures... Maybe if you used your nice new wood texture? You removed a lot of possibilities for shortcuts, but there are still lots left over! Nice!
Best times :
Level 01 - 6'69" replay
Level 02 - 9'28" replay
Level 03 - ???? (haven't really tried one yet)
Level 04 - 29'95" replay
Level 05 - 17'46"replay
I'll post replay links here in a minute... if anyone want to see them.
Edit : Okay, some are posted.