I hope you had fun throwing and receiving and constantly killing an innocent defenseless baby in the sake of finishing the game XD
It sounds bad cause I made it in a day :)
THANKS FOR PLAYING!!!!!
Well Yes and no, yes as in it's open source so you can get the engine and change stuff and no one can do nothing to you, you can change the name of the engine and the logo and add features and remove features and what not, it's all up to you so every code you write even the code for the engine is yours and no royalty attached whatsoever and no as in the engine is being built by 1000+ people on GitHub, there are people fixing bugs, adding features and just making the engine a whole lot better. So yeah that's that I really recommend Godot though it uses a python-like programming language and the UI is pretty friendly I do recommend you try it out.
Nahhhh it's an extremely complex process that requires you to download Android studio and set it up download the ndk and download Java JDK and then implement that in unity and it's much more complex than a HTML file, a good tutorial should help either way just YouTube or Google it whichever you prefer
Do you code them from scratch cause a highly recommend getting a game engine like Godot it's programming language is basically python but specially made for the engine. It's a 50mb download size and it's is very very beginner friendly, I highly recommend you check it out you'll be amazed by what it can do.