Honestly, I got a bit of the girl-game vibe as well. This has zero to do with the gameplay and everything to do with the characterisation. No one would say Metroid's a girl game, even though the main character is female; it's just a good game. Likewise, Tomb Raider's not a girl game, but it's pretty clearly a guy game (and a terrible game, at that, mwahaha). Naija's portrayed as.. I'm not sure what age, but probably <20. The dialogue and the performance are really solidly female-oriented, probably adolescent female at that. So, I'm not talking about "girl game" in the sense of a Barbie game, or a baby-raising or horse-training game, just a game that
feels like it's skewed towards a particular demographic due to both the story, and how that story is told.
This is not a bad thing! It is just
a thing. The base game mechanics are pretty good, and if you took out all the dialogue it'd still be a great game (I'd say it might even be better than now

.
To sum up to the original poster: I get where you're coming from and I'm inclined to agree. However! Aquaria is a very well put-together game and can and should be enjoyed by anyone, regardless of age and gender.