[harles]

An indie studio building not only its own engine but its own language to make its own engine seems like a huge mistake.

[badsectoracula]

Considering the money he made from Braid alone (let alone The Witness, which back then he claimed that it was about to surpass Braid's sales) - $4m mentioned at some point - i'd say the mistake would be his expenses.

$4m alone (again, let alone his other games) would be enough to retire and make languges, engines and whatever else he wanted.

[santoshalper]

For yourself, sure. To pay others to do it? Hardly. A two-pizza team in the US costs $1M to $2M a year fully loaded, depending on location.