Hexels just had a new version go into beta, which includes layers (making my old tutorial pretty obsolete), new drawing modes and a-n-i-m-a-t-i-o-n!
Its pretty awesome, letting you export your anims to images, sprite sheets (!) and gif files! The gifs are super optimised by the way, making them particularly tumblr friendly in terms of quality and filesize.
Anyway in order to test this functionality here is a quick Mass Effect Avenger Rifle folding and unfolding, made in the new “X-Els” mode (basically symmetrical trixels). Hope you like it!