The One Gamer Fund charity event is starting today. You can purchase Nanuleu and other awesome games on sale and help various charities related to videogames.
Check the event page here https://store.steampowered.com/sale/OneGamerFund
The charities are: Global Game Jam, IGDA Foundation, Take This, Chid's Play, The AbleGamers Charity, Games For Change and Stack Up.
Also you can donate directly and participate in streams and other activities here http://onegamerfund.org