Took me 3 tries to beat it, the first I thought the enrgy was an enemy attack as both are colored the same, I also fought the boss only once, maybe someone could have missed it. Overall quite fun and with the correct game duration.
Thank you for playing! The boss is a random spawn based on some criteria, however, its pretty unlikely not to see it if you play long enough. I think in all of my test plays I didn't see the boss once. You must have gotten some serious RNG to not have seen it twice in 3 plays!