Nice little puzzle game, with great puzzle design. What seems trivial at first reveals itself to be more than it first appears. Didn't anticipate not being able to cross the lines at all, but was pleased. Adds a unique constraint to the puzzles.
Simple art style works well here (Shapes plugin, I presume?). Pentagons are pretty hard to tell apart from hexagons at a glance, and while I have good colour perception, there's a lot of gamers who are colour blind. You could have had a few more dimensions to match with for those players. Eg, crosses instead of pentagons, patterns of fills as well as colours etc.
I also like the decision to put all the shapes on a defined grid. No confusion about where you can and can't put lines, what shapes block lines and so on.
Would I be right in saying some of the puzzles (perhaps all) have multiple solutions?
Is this the end of the game? It looks like I've got the solution, but the shapes haven't started dancing...
Minor flaws aside, for a 48 hour game, it's pretty incredible!