Aw heck yeah I just played 4.1 and it finally gave me some of those "Aha!" moments everyone talks about :)
While I'm still not a fan of being able to get stuck and having to restart the whole level, this time around it felt a lot more like it was my fault for getting stuck, which made the whole experience a lot less frustrating. It will be interesting to see how that keeps up when the puzzles get more complicated.
It was fun to have two magnets to work with, but I'm a little surprised that they aren't attracted to each other (although if they're supposed to be siblings I guess it's better that they aren't)
One final thing I noticed, the music, sound effects, improved graphics, and even the little conversation at the beginning really made it feel 1000x more professional. I guess it's true what they say about presentation.
This has been really inspirational to watch the development of. As a fellow game designer, I'll be sure to take notes.