The screen goes black every time I enter that level, no matter if t's after beating the sewers, going directly on the map or using the level select.

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I only got like 5000 Gold after completing normal mode but I need maybe 100000 or so for unlocks The chances are most people won't play it twice, it would be nice to have reduces prices or faster earnings, that way you can try other colors and effects while on the first playthrough...

Could you let me apply soundtrack from the first stage to all of the level? Maybe like a build in music player where you can force a chosen melody for entire game.

Check your graphics card configuration for a setting called "Texture Quality" or something similar. This may or may not be under the 3D settings. Once you find it, you will probably be able to switch it between high performance and high quality. Set it to high quality and the text should render correctly. Hope this helps someone at least....