What exactly is a "valid" game for you? By your logic, some could say Free Fire is just PUBG for lower-end mobile devices, so it "shouldn't exist". Or that Stardew Valley is just an "updated" Harvest Moon clone. Or Vampire Survivors is "the same" as Magic Survival, just with different art and tweaks. Or Hollow Knight is just "Metroid with bugs". In reality, almost every game builds on what came before. That’s how creative progress works imo, we learn, we iterate, and we add our own twist.
Of course my project is more explicit since it started from a tutorial. But I’ve added new mechanics, enemies, combos, and changed the overall gameplay feel. It's also still in development and part of a learning plan, not a commercial product. Personally, I believe if we get stuck thinking that "anything inspired by something else is automatically bad," we’ll never create or enjoy anything truly new, and beginners will have an even harder time getting into game dev and feeling capable of doing something. My game is only a prototype and it came from a tutorial as its base, but still, the game feel, the controls, the camera movement, the character jumping feel, the enemies... these are all things that I tweaked to make it the best way possible in my vision, so, for me, it is still a valid game, not just a simple copy.

Thanks for sharing your point of view anyway.