I did a Markdown version of Tunnel Goons v1.2
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I think it's appropriate myself, but just to check, how about MacPaint? Specifically using cloudpaint.com here (I tried to get it to work via emulation but it turned into such a faff that I thought I was losing the point of the jam). While it does have patterns, it's generally very simple, though cutting-edge in 1986.
Not sure whether there's a better place to report issues, but the scroll tool hasn't worked in Safari (OS X 10.15.5) for the last couple of versions for me. Holding space does give the grabbing-hand pointer and removes the cross-hatching, but click-dragging does not scroll the map.
Works fine in Firefox.