There's no publisher, they're as indie as they come. The original prototype and game were made by burning through their savings, and it sold millions of copies, so they're completely sheltered from need for the rest of their lives. Silksong is only adding to that wealth. I feel like they're very decent people who succeeded because they love what they do, and are good at it.

Low price doesn't necessarily lead to less profit though, since the lesser the price, the more people who will be able to afford it. The devs probably want to get as many players as possible to play Silksong.

This price point makes impulse buys much more likely, which can make a huge difference when your game has so much hype.

but I also feel kind of bad for the devs

Why? They chose the price. They obviously think this is better than a $60+ price tag for a reason.

*Out of curiosity, I checked the HK release price and it was $15 USD in 2015, which, adjusted for inflation, is ~$20 today. So this is a pattern with their games.

Honestly with all the free dlc from Hollow Knight and Team Cherry already stating plans for future dlcs for Silksong, I would probably drop $60 without thinking. I love indie games way more than the AAA bullshit that gets released now.