How does this game work? What are the controls? I think I've hit every key on my keyboard and I haven't been able to get the game to do anything so far as far as I can tell..
You already completed the game's short loop, in a sense.
Slow motions in smearing your hand across the surface of your keyboard (hopefully not a mechanical one) nudge the ball around the space, then, after leaving the viewable area, it resets. Though anything too abrasive and the ball either juts about a single spot or slowly meanders its way into the distance.
Okay, maybe I was expecting the game to do something different, as I was going from the controls in the game's launcher (Unity default stuff I guess?)
But still, after smearing my keyboard for a few minutes, I was only able to get the ball to move when I hit the C or spacebar, but usually only after the third key press.
The behavior of the ball is the same whether I tap it slowly, quickly, holding the keys down for different lengths of time; the ball makes a little hop on the third keypress, moves slowly upward, resets when it leaves the screen, then sits in the middle of the screen and doesn't respond to any input after that.
EDIT: If I hold down the C key while the ball resets, it will roll away after it drops.
Yeah, ignore the launcher's key bindings.
I added multiple spawn points to prevent players holding down individual keys to nudge the ball away on reset; unless you've been incredibly unlucky and every instance where the ball resets has been around the C/ spacebar key, that's quite unfortunate. There are however tools I implemented to ensure the ball doesn't get stuck (for me to say it's never happened to me nor it could never happen would be disparaging to your case), but in all probability for the ball to either not respond to input in the lower-half of the screen or simply freeze within the perpetual-velocity machine outside, is quite slim. Physics I guess.
Eventually the ball will make its way offscreen, it's down to you if you place value in its efficiency in doing so.