Ok so already congratulation, it's the first mod of 087-b wich add real content and doesn't change just the texture.
So now I enable some little crtiques. Already there is a problem with the generation of the first rooms, it's always the same bug, you should fix that, I think you should keep the original texture, I have tried replacing yours with the original, that look very better, and just in passage, I love the light effect. You should put again the dark smoke too, and finally remove all these crazy and funny songs, it's funny at the beginning, but frankly after that become anoying, or maybe make in this case make two versions of your game, a one totally crazy and funny, and the other scary and serious. ^^'
After I have personal questions about how work the game, I make studies in informatica, and I would want too to modify the code of this game. So I asked me how you have did for adding sounds, textures, rooms...