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.

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.

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.

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

My count of favorite HTML5 games moves up to 3. First Subbania then Buildy and now this one. You should probably add more physics as @ivan_ah said.

Really interesting game! I love the concept. It's simple, yet challenging. I am finding it quite hard, which is good.

I couldn't figure out level 5, and here is my level six at the moment http://i.imgur.com/vvZOX.png bit of tweaking and I'll have it

I don't know if you want a hint, but... If you do it the right way, no tweaking is needed at all. (The puzzle can be viewed as a very nice illustration of ergodic trajectories.)

infinite power!

http://imgur.com/AbvXE

In case people are curious, the reflection limit per laser is currently set to 500 to avoid infinite loops.

This is very cool.

I would be interested in collaborating with you to add some more physics: refraction (laser passing through slabs of glass) and curved surfaces (parabolic mirrors and lenses using the thin-lens approximation).

This would be the coolest way to learn about ray-optics.

Nice ideas! I have a small list of higher priority features to add first, but I am adding these to my queue:

- refraction polygons - concave/convex lenses - concave/convex mirrors

I think the easiest way to add these would be to just make them fixed objects in the level (so the only drag-able items would still be the straight mirrors).

I love this, but I would like to be able to return to my solved puzzles after I've done them (assumed that's what the "Save" button did).

Quite happy to finally get level 11 done.

I have to say, the game is cool, and it works fine with my Palemoon(Lots of HTML5 games do not work well with this browser).