I think the whole situation boils down to the buyer being aware what they’re getting themselves into. And with so many videos online you can’t really say you had no idea what you were buying. If this is the case, then blame the mirror 
Also, Gameshell may be reluctant to accept returns which cannot be resold. They are a rather small business, niche, and as you can see they invest whatever money they make to improve the console, the community build around it (the Warehouse is a neat thing), plus most likely developing for future parts and very likely a new model. So they don’t really like encouraging buyers to return the full kits, because part of them cannot be re-sold.
Now what you can do is either force their hand, which would be a dich move, or sell the console for a loss to recover some of the money. And next time do research your purchases before you make the payments, and take responsibility for your spendings. Returning an otherwise functional product from a kickstarter is a bit immature.