Before all, I would like to say that Teturss is a game that I made in order to have an ad-free Tetris game that I can play everywhere, and with the rules I like the most in Tetris games.
1. Sticky and Cascade Methods are indeed not implemented. The versions of Tetris I played the most does not support them and it explains why I didn't implemented them. It doesn't mean that I do not like them, it just means that I didn't find a good reason considering my Tetris experience to add them.
2. I am a huge fan of Pixel Art... And it makes me sad to see this kind of comment ^^ But I know that "In matters of taste, there can be no disputes". So what can I do about it. Sorry you do not like it :^/
3. I learned how to use Unity during my studies. Therefore I am comfortable with it, it is free, that's all I need to keep using it ^^ But yeah I understand the argument saying that it is not the most optimized software for this kind of project.
4. I started to do it, but realized I needed to create a custom file manager in order to let the user select the music he wants. It discouraged me...
5. Laziness. That's the only argument I have for my defense here ^^
I hope it answered your questions and gave you a new (or even better) point of view about my game :^)
And sorry if I seem to harsh in my sentences. It is the first project I managed to finish and publish so I'm kinda sensible about it ^^