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Great concept, very original. The contrast between the light and dark gray is a little too high. It disjoints the logo a little bit too much. You could lighten up the darker areas and still achieve the look you want.
Something is a little off about the alignment as well. This might be difficult to fix because of the wide bottom of the d and the extension of the t. Unfortunately I'm not really sure what to suggest, but it does look a little awkward because of this.
