Oh, note that my estimates above account for people making a living wage, not people in a startup environment doing it for 'the love of the project' or 'equity' plus a subsistence (rent & ramen) check.

18k is probably enough to throw up some AdSense ads, a few banners on other web games, pay for an EC2 instance and a domain, and feed/house 4 people for two months if they have roommates/partners/family who are helping them while they donate all of their time to the development and content development aspects.