I wrote this game for the Ludum Dare 26 Game Jam:

I finished this with three minutes to spare before the submission deadline, so it’s almost completely lacking proper game balance. I’ve been able to discover Hydrogen, Helium, and Lithium in the game and suspect that most people won’t be able to discover more than a few elements beyond those.

There’s just too much antimatter!

If you prefer, you can play it larger. That provides a more immersive experience, but be aware that the mouse control only works within a rectangle the shape you see above, so I suggest you make your browser window that shape if you play the larger version.