I love minimalism, but minimalism never sells. As a indie hacker, why would I adopt a simple and lightweight framework (core code < 500 lines) when I can write the 500 lines myself and have it exactly my way? I would suggest you find a niche and optimize for it.
Minimalism in code size is nice, but only to the author himself. Minimalism on the API surface area will be more valuable to the users.
