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Well done! My train-obsessed 3 year old would approve of the stamp toolbar defaulting to a train.

A button to download the canvas as a png or jpg would be nice for saving and sharing special creations.

Same with my kids! See also the draggable train tracks! :D

not at all obvious: keyboard, 's' to save/download :)

Ah, nice! :) The Github did mention that there was a handful of hidden features.