Sometimes I could solve a level with 3-4 spare parts, and this happened more often near the end. Perhaps have a mode where a person could solve the puzzle in an easier fashion, and a mode where the user tries to use the least possible pieces.
I wouldnt have the spare parts placed within the lvl, despite the green glowing indicating which parts you can move, I would say it tends to be a little confusing at first, though I didn't play the first or second one so the argument may not be valid.
However having the pieces within the level could also be a puzzle in itself. If some pieces are large and only fit in a certain way, the user might have to move the pieces wisely in order to get the pieces where he/she wants. Just an idea here, nice game overall, pretty steady difficulty curve.
nice concept, There was a part where I got stuck when I went next to the bomb in the last lvl, but I paused/unpaused and it unstuck itself. Think the ending could be more clear, otherwise, really cool with the non-static ground. :)
Enter to skip intro sequence.
There is a minimize button or you can click instruction button to close window.
Press down when next to a friend in the menu screen to switch out.
Thanks for the positive and negative comments... I'll keep in mind the biggest problems this game had when I do other stuff when I have time.