For some reason, it reminds me of The Powder Toy.
The download link still works (as for the JAR itself, I don't know, since I can't test it on mine due to my computer being a borrowed computer from my workplace).
I wonder if any of the Buildism/2DWorlds chat logs and/or forums, along with any of the games are archived? It would be very awkward, but funny to look back on the Buildism/2DWorlds chat logs/forums, when I was an awful child/adolescent.
wowowowow can't even play it without logging in bad game i'm sad
i see where the inspiration for the new os forum got it from