This video is a lot of fun to watch.
http://www.engadget.com/2015/05/09/castlevania-symphony-of-the-night-devs-play/
IGA is talking about Castlevania : Symphony Of The Night, the things he remembers from the project as someone (from Double Fine!) plays it a little.
I'm about half an hour in, it's a really long video - over 2 hours long.
It's fascinating stuff! Really gives you an insight as to what it was like, building this game. It sounds like it was a great little team working on the project, and they all had input as to what was going to be in the final product, and they weren't afraid to add in weird little secrets for players.
Warning: Your heart might be broken as you hear of the things left unfinished, the things that were cut out. It turned out well though, don't you think?