I was feeling nostalgic today and wanted to play those old Paulok fangames that you made a while back (I was obsessed with them during the pandemic lmao) and when I saw that you were promoting a new game of yours (well, a "new" game announced a year ago that is, I am REALLY late to the party on that one), I immediately went to check it. I wasn't expecting much at first but after playing this demo, I must say that I was blown away by it ! You can tell that this is your passion project, and while it is a bit simple, it sure is damn charming game !
The Gameboy style fits really well and, for once, it doesn't feel like a random "#soretro" game in black and white, everything from the character desing to the music (I especially loved when Winter by Vivaldi played during the boss fight ^^) remind me of real Gameboy games. Form the the game's description, you seemed to have been inspired by Zelda II but it's also close to a Metroid II imo (the Gameboy aesthetic might help on that) and it honestly blend well together. The 16:9 aspect is pretyy sweet I must say, for those who would want a more "authentic" experience, there is a 4:3 ratio though I haven't played with it turned on so I can't really tell but it seems that the game works fine with it as well.
Overall, this was a really great demo and I am looking forward to see the full game as soon as it released, I already put it in my Steam's wishlist ! It's amazing to see how far you've came since your first games in th Godot engine, I hope that your game will find the public that it definitively needs !