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Once again, possible, but not free :) Definitely something I'd look at for the paid version, because I can appreciate the benefits.  It's not the technical considerations, it's the design considerations. I made this game to support 4:3 screens, it doesn't seem right to re-release it and not have it played in its original style - I have an arcade cabinet that uses a real CRT and want to keep playing it on that (and I was contacted by someone else doing the same thing!) so adding support for widescreen levels would mean handling what happens when it's on a CRT - probably labelling them as "widescreen" in the level select interface, and either popping up a warning and just cropping out the extra space (and letting the players get lost off screen), maybe instead zooming out (but that would be hard to see on a CRT), or just locking those levels altogether... you can see how this affects development from a design perspective!  Open to ideas though.