It sometimes baffles me when moderately successful indie games release a lot of amazing new stuff and don't make it a paid expansion ("dlc").
Often I would buy it, at least on sale, and I'm pretty poor. Normal prices for these things are pretty good value - indies are kind of underpriced if anything.
Heck, if you do want to be generous at least add a donation DLC so people can _choose_ to give you more money when you give more game. Some people do it.