Use scratch. My kid loves it, and despite him being only 6 when he started, he actually knows what he's doing. His games are mostly 'the cat flies through the air when it touches the cheese' (in other words, not really a game) but he has tons of fun.

‘Despite feedback’. Was that feedback clearly given in a sit down? With more than 4eyes present? Confirmed afterwards in writing to the employee, in a clearly worded ‘here is what we discussed’ email, stating behavior and output has to be stepped up? If ever it came to a discussion be it personally or even legally, do you have a track record to prove to yourself you did enough to warn him? If yes, then let him go. If it’s ambiguous, I would reconsider, from a legal and personal pov. Depending on the amount of vesting after this cliff, it might be worth it to let him go w some of the shares two months from now, and take your loss (moment of learning) for not resolving this in a more timely manner, and be more on top of it with other employees.

You will never get it this small/big/fast/powerful/affordable is what has been said about a lot of industries/technologies in the past.

Question is, will Lytro be able to do it? Will they have the money&perseverance? With their financials they are not likely to move fast enough on this, 5mp equivalent in 2014 is not very impressive. I shelved my Lytro v1 after a couple of days because of the poor image quality, not because of the 'gimmick' disappointing me.