How to use
Drag across the canvas with a mouse, finger or pen. Select Sample canvas, then drag a rectangle to turn part of your drawing into a stamp.
For keyboard stamping: focus the canvas, use arrow keys to position a stamp, then press Space or Enter to place it. Hold Shift for bigger moves. Ctrl/Cmd + Z undoes a stroke.
PNG is the only export. Desktop or tablet offers the most room. Pen pressure and touch behaviour vary by device; this is an experimental tool.