I've just rediscovered Knytt Stories (because I found the DS version) and have been playing through a few classics, and I realized I never played this one! I just finished it, finding as many different areas as I could, and I am blown away. The sheer charm of this level just makes me grin. Of course, the fact that the DS version has a map made me fill out as many screens as I could because of how much of a completionist I am... but it's an amazing level.
One thing I noticed, though, is that it's very, very easy to "escape" the intended play area at the end of the world area, since the ground and walls are pixel-thin. They often don't match up exactly at screen areas. I found no fewer than three distinct places where I could either become trapped or fall into endless void. It may be in your best interest to see if there's anything you can do there.
I'm playing 1.5 though, and if you've fixed it since I apologize. I have a question, though: Does anyone know if I'll lose my DS map if I install the new version? Does it overwrite 1.5 or install separately? Can I transfer my save at all?