All of the DLC really improved the base game a lot, and the final horizon in particular is very enjoyable and has probably the most memorable sequences in the entire game. While the boss rush near the end is really difficult, I prefer this ending to the base game's ending as it is much more fun and visually entertaining. The other playable characters is also such a massive improvement to the flow of the game. There are still a few wonky controls but otherwise this is a great way to cap off Sonic Frontiers.