What are the ways to monetize downloadable casual games?

Question

Monetization

I mean games that are written by one or two or three people. But a little more complex than casual flash games. I saw sites that distribute them for free on the net, but there were no contacts for developers anywhere. It would be ideal if there was a resource for selling them like flashgamelicense.com , but all options are interesting.
And in general, what are the prospects in this direction?

Answer 1

If casual games are written in series, in the same style, and for one target audience, it is quite likely to donate from the regulars.

Answer 2

Downloadable content (mods, levels)

Answer 3

shareware, adware

Answer 4

access to online puzomerkas (posting the achievements of the person who paid for access in the corresponding rating plates on the developer's website)