I played the first 5 levels and it looks like an interesting gimmick, but still kind of a gimmick. Some games are entirely centered around one technological "gimmick" it seems. Someone comes up with one interesting idea that is such a new/different thing that they can base a whole game on it. And sometimes that works, especially if you incorporate a few other elements into the game (like the game "Portal"). I played the first 5 levels of this game, and I am impressed by some of the technical feats they have accomplished here -- quite remarkable, especially in Flash. But it does seem to be entirely based on this one idea. It's good for little games, but as far as playability, I prefer epic games, with some more variety and maybe some story.
When it comes to SGDK2, I think you have the power to create many ideas combined into one game to make a much bigger game with a much wider variety of gameplay. And when it comes to SGDK2, I think technical gimmicks like this cost more effort and give less reward. I suspect that many technical gimmicks start with someone going "Wow, look what happens if I do X with Y! I could make a game out of that!" But if you start with the idea and try to figure out how to implement it with another technology, it's much more difficult. I think you will get much bigger bang for your efforts if you explore what already exists in .NET and SGDK2 asking the question "What X can I do with SGDK2 that will make people go 'Wow'?"
. That's what I'm trying to do with "Clean Game" (which will probably change name to something like "Gene Therapy" or "Nanobotix"). Create a wide variety of interesting interactions and sprite behaviors all combined in one game, so you can get a lot of gameplay out of one game, without having to put too much effort into creating new levels.
Oh, and I remember being quite impressed by Durnurd's weather effects add-on for SGDK2.
