[braum]

interesting especially in HTML but the black lines (mirrors) need to be able to MOVE as well as adjust the length. Maybe I missed it but the only way to move a mirror is to walk it one edge at a time.

[mavlee]

You can move by dragging either end of the mirror. It's not entirely obvious, maybe an easier way to move the mirror would be helpful.

[anigbrowl]

Yes, this is painful as is. Also, when I complete a level the entire frame shifts about 10 pixels to the left as the save button appears. Nice concept though.

[byronknoll]

The left shift is probably due to the scroll bar appearing (since the save button makes the page slightly longer).