Oooh, nice. Balancing output over area is really fun. I wasn't sure if there was an end-game, but I got pretty far. It became a bit like cookie clicker towards the end; it would be nice to upgrade power output as well. Good work! [Edit: retracted statement on power output, see reply]
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Oh, dear, I figured out my mistake. For no reason at all, I assumed that the button was a static, singular payout. I, in fact, completely missed the fact that I could *hold the button down.* I couldn't reach the end because I was trying to dole out power by rapidly clicking the button, like it was some kind of clicking game. I don't know how I came to this conclusion.
After realizing this, I easily beat the game. It was just as fun the second time around!