Here are some roast comeback options for the given dialogue, varying in tone and length:

Option 1 (Short & Sarcastic):

"Oh, color is your only redeeming quality? I'm shocked."

Option 2 (Medium & Playful):

"Well, Troph, at least your design has... something. I'm still trying to figure out what that something is."

Option 3 (Long & Witty):

"Troph, darling, while I appreciate your bold use of color – a choice that screams 'I lack subtlety and sophistication' – I must point out that functionality often trumps aesthetics. Your design may be a vibrant explosion of hues, but if it doesn't actually work, it's just a very pretty paperweight. And Wick, your self-deprecating mumbling is endearing, but don't let Troph's superficial brilliance distract you from your own potential for greatness. As for Helpee, well, a supercomputer shouldn't be so easily surprised by a poorly designed… thing. Perhaps a software update is in order?"

Option 4 (Short & Aggressive):

"Color? That's the best you've got? Pathetic."

Option 5 (Medium & Sarcastic):

"Wow, Troph, you're really leaning into that 'visually stimulating but utterly useless' aesthetic. Bravo."

The best option will depend on the desired level of aggression and the overall tone of the conversation.