I think that's the joke.
The fact that this game would look a lot like Dan Ball to a new player.
I saw the radiation sign in the bottom right corner that housed URAN, PLUT, DEUT, ect., and clicked on it. Lets just say I never went back.
The oldest save I can remember is one I made that was just a giant mesh of DEST and BOMB (I called it "tpt's most powerful bomb", even though it was ridiculously weak)
I would just open saves and start dropping particles on them, seeing what they did.
Well some of the first few saves I remember looking at are cm6's laser collection and cate's laser and nuclear flamethrower:
My first online save was a crappy plasma/vacu (bhol back then) heated 4px width beam cloned photon laser (I didn't know how to use pcln back then) whose two middle beams didn't touch the heating elements (so only the two outer beams were actually hot; about 6000-7000 XD) and it was really pretty long (took up a fifth of the screen in terms of length if I remember correctly). It was tapered at the front as I then had a misconception that the photons could be controlled and focused by doing this. It would've served as extra heating as well but I don't think the beam even touched it XD.
Found it! It was published on Nov 2010:
Edit: Here are some others I found: