Specter Spelunker Shrinks

Specter Spelunker Shrinks - A Online Platformer Game | Game Jolt

I hate most browser based indie games with a passion, so imagine my surprise when I played this and it was actually good. Not just good actually, but great. Very innovative, fun, and it has a cool soundtrack and some well thought out level design. I'd love to see this turned into a full fledged platformer.

And what kind of plugin do you need for this game?

The Unity webplayer. Firefox took me to it automatically when I needed to install it.

UNITY: Unity Web Player

Strange, my Firefox told me it required an "unknown plugin".