Really good concept!
I enjoyed it, it was presented well and the core gameplay was solid. It was a bit of a thin offering though. Here's what I'd suggest for another one:
-Mix up what you have to order: building on the '1,2,3,4' set, you could have four sums or other arithmetic equations to order e.g. '3x4,2+7,16-3,4*2'. Generally, some slightly intellectual and perhaps non-picture series would work well, like release dates of movies. You could even open it up to the BBS to offer series.
-Sometimes it's a little vague regarding which direction to go in. Am I building the man from the top or from the bottom? Is the battery draining or charging? That sort of thing. Just a little clarification needed.
There's a lot of potential in this; the next one could be a real winner! Still, nice job!