I am genuinely speechless. Especially with the amount of overthinking and failed attempts it took to make this (if you obtain the two raindrop halves you will see what I mean ) your words mean the world to me.
I had to struggle a lot to make this game. And so I wanted to make it into something special. I poured everything I could inside the game. All the love that the other games I tried to make deserved, and I am glad you are appreciating all the little details. All the games that I loved growing up, if nothing else, taught me the feelings a good game should give you. From your words, I believe I was able to replicate those feelings. And that is the most I could ever ask for.
To make the game fullscreen you can press F4.
There is actually a little bit of history behind the F4 key being the "fullscreen key", if you can believe it.
That is the key used to fullscreen RPG Maker games (I believe from RPGM2003 onwards but I may be wrong). Specifically in OFF, the game that changed my life when I first played it, seven years or so ago.
When you first boot up any of those games, before the title screen there used to be a big phoenix with "KADOKAWA" below it (the makers of RPG Maker) and a "Press F4 to Fullscreen" in the top right. That screen has been burned into my mind ever since I played those games. To me, that was the "this game is going to be awesome" screen, similar to what for some people the PS1 boot chime is.