It still plays roughly the same (but with normal speed now!), but it looks and sounds 100x better. All of the graphics were overhauled, the music was remade/remixed (depending on the track... and one was completely replaced, plus one new one brought in), cutscenes were added, and a whole mess of bonus content, including a bonus minigame, were added. Also, the normal game contains an additional area, and there's now an "EX Game" with an entirely new set of areas, new enemies and equipment, an alternate storyline, and an alternate ending.