OK, some technical progress has been made... even if not level-2-progress.
The demo has now been updated with an options menu. You can select different canvas resolutions from which a full screen game will be rendered. With low quality selected as well then this should allow weaker GPUs to render to full screen without getting max'd out... With high quality selected then, well, you get high quality in full screen. Give it a try and let me know what you think or if you find any bugs. This also resizes the nw screen if not in full screen.
I attempted to use the new local storage plugin but found it long-winded compared to webstorage. As I am not planning to sell to the Chrome store I've elected to keep using the webstorage plugin. However, I have made some efficiency changes to the game-save logic as part of this work, and it's incompatible with the previous game save logic - so you'll have to start from the beginning.... Not to worry!! Press the 0 - 3 keys to magically teleport between the different game save locations.