What I know is, back then, this game was developed using Game Maker 7 Pro.
And then so on, it was Game Maker 8 Pro.
And this game is still today, using Game Maker 8! You know, Game Maker 8 is pretty outdated.
I mean, game's cool and all, but, I think it would've been more necessary if the game used GameMaker: Studio (or at least GMS2).
I just don't know how the developers were able to pull that much fluid and dynamicness using Game Maker 8. I don't think it's possible.