I'm not really sure what I just played, but it was fantastic. You basically explore different environments as a fly collecting as many orbs as you can get to before running into a scene changing obstacle.
Something about the package as a whole makes it as special as it is. The combination of early 2000's rock and obscure isometric platforming (?) gives it a Wheezer-esque feel in some way. Not to mention the contrast between the pencil driven artwork and blue background makes it hold up really well 20 years later.