I agree. I find it hard to be upset that new games are coming out for older platforms. To think that Knights of Bytes have done something not many mainstream, let alone indie, developers did - add things to this port.
I love seeing these new games for old platforms. Some are absolutely awesome, others make you think, and then there are the ones like you mentioned, that take a previously unfinished game and complete it.
That is something that Piko Interactive does. They purchase the rights to unfinished games and finish them. One they did was 40 Winks for the Nintendo 64, a previously unreleased game that was thought lost to history.
RE: New Sam’s Journey on Nintendo NES Footage Released