A remake of the Nebulus music is available on Youtube by Alpiso.

That was a hard game, I only went to the second tower (and there are 8 of them), so if you want to see all towers, here is a longplay of Nebulus by Wanderlain on Youtube.

You can also play remakes of Nebulus : Tower Toppler for windows, linux, BeOS and MacOS X, or Power Toppler for Iphone with 2 missions of 8 towers, it has been developped by Silver Software (the game cost 0,79 €).