This was a great ending to a great show. I have read the manga past this point, and I believe they changed the sequence of things a bit to end things in a satisfying way. If I remember correctly, there is quite a bit of exploration of the dungeon that happens (it’s kind of a long arc if memory serves) and I don’t remember this kiss in the park at all (though it’s been a while since I last read the series). So, I suspect they brought that moment forward in the sequence quite a bit to provide a nice conclusion to things.

Frankly, I think its the right move. I don’t expect this to get a season 2 and ending the show with the beginning of a long dungeon crawling arc would be immensely unsatisfying.