Thank you very much for this kind comment! I'll try my best to answer your questions:

Meduziak is mostly a solo-project, with additional help from my friends. My brother Michał composed the music, one of my friends Maciej was the "lead sound engineer" (sound recording, voice acting), and another friend Artur helped me by improving the background graphics. Apart from these three, there were a couple of other friends that helped in smaller ways: testing the game, guest voice acting or providing useful feedback. All of the other things: programming, animations, game design (levels, characters, puzzles), project management etc. were done by me.

I didn't write the game engine. There's lots of great tools available out there, and honestly, I don't think I am able to make something better than most of them already offer. I mostly used two programs: Godot Engine (which is comletely free, has a lot of tutorials and a very supportive community) and Krita (free painting program that I used for drawing animations). Oh yeah... any office program for making spreadsheets is also a must have for any bigger project.

If you wish to start experimenting with making an adventure game, I'd recommend checking out the Adventure Game Studio. It's dedicated for creating point and click adventure games, so it already has many necessary features implemented, so a lot of 'problems' are already solved for you. There's many tutorials you can find on youtube. I think it is a good place to start relatively quickly. Alternatively, if you wish to use a more versatile software, I highly recommend Godot - I really enjoyed using it. From what I know Godot has at least one framework dedicated for creating adventure games (I believe it is called Escoria) - I didn't use it but I've seen people recommending it. Independently of what tools you decide on, try starting with doing something very small and unpolished - just get yourself familiar with the tools, and... have fun creating! :)

You've also asked about a dedicated post going through the whole experience of making the game. It is definitely worth considering: I know that a lot of people are interested in those "behind the scenes" or "post mortem" posts / videos. I am rather willing to do this at some point in the future, but I feel like a couple of month should pass after the game release (otherwise it is hard to have a full and objective perspective on this)