Hey, read through the comments as I know how hard it is to communicate a game's purpose on game jams (for example, my game also met some confused folks, because I provided info on the game page and not in game). As my rule of thumb, if you are creating something that will not be trivial to the player, you should communicate it through multiple channels to set the expectation.
Even providing a bit more information, or "disclaimer" on the game page since you don't have a menu would have helped a long way.
By the way, I assumed that I'm also a worm, because of the tank movement, that's a neat touch.
I've only seen one exhibit in a form of a game, that was Goliath: Playing with Reality . Probably some narration every so often would have helped keep me in the game. Or the dome could have connected to some other domes were subtle things would change, like a museum.
Hope you'll find your angle to this game, because it's quite a niche style, you might get the attention of your audience.