Yes, it was easy.

Your turn now.

Is indeed Populous 3, the very first level. One of my favorite games :)
Edit: Ninja'd

Ok, next one:

Since this is probably quite an obscure 5 years old (on Steam) indie game, I'll give a text hint now: "Kafka".

I know what game this is, but I'll give others a chance.

The Franz Kafka Videogame?

... no

The "Kafka" hint does refer to the game's title, but no "Kafka" itself is not actually in the title.

then, Metamorphosis?

You're on the right track, but did you look at the screenshots?

Some more:

I know it's a Metroidvania, but I can't find anything related to the game

You won't find the game's title by searching by the exact book titles by Kafka because the spelling used in the game's name is ... different. Not that it's misspelled, it's just a different related word. Or rather the same word in a different language, it seems, now that I actually look it up.

Lets put all the non-screenshot hints together in case it'll help people, as I don't think more screenshots will right now:

It's a 5 year old indie metroidvania on Steam, with a name that sounds like (but isn't spelled exactly like) the title of a Kafka book.

finally I found it!

it's Metamorfose S

You got it! Your turn!