Danny Phantom - The Ultimate Enemy on GBA is basically a side-scrolling beat 'em up where you play as Danny in his ghost form, zipping around and blasting enemies with ecto-blasts. It's got that classic early 2000s cartoon vibe—bright colors, exaggerated animations, and some decent voice clips that actually sound like the show.

You start off fighting basic ghosts in Amity Park, but things get interesting when the environments shift to the Ghost Zone. The platforming can be a little floaty (kinda fitting for a half-ghost, I guess), and the combat's simple but satisfying when you pull off combos. Not gonna lie, some of the enemy patterns feel cheap after a while, but unlocking new abilities helps balance it out.

If you grew up on the show, it's a fun little nostalgia trip—just don't expect anything groundbreaking.