Thanks so much, I'm really happy you enjoyed it! You solved the puzzle as intended, congrats (and good luck if you look for the other badges!) I had planned some sort of fun Easter egg if you held onto the soap but ran out of time, dang it.
It's odd that you were able to encounter the multibeast that early, the global encounter rate should be 0 until the east bridge is clear. I just walked back and forth for awhile in the first area and couldn't reproduce it. Which version did you play?