Aseprite sounds interesting, thanks for the tip! So far I've used GIMP for all the simple pixel graphics. But it remains to be seen how much actual pixel graphics we are going to need for Ancient Savo (and who is going to draw them). The human shapes seen in the picture are "digitally hand-drawn" by one of my friends. I don't know what software was used, but for the actual drawing the tool was something like a usb drawing tablet.