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Gamemaker is also a popular choice, several top games on steam have been done with gamemaker, Zuhane mentioned HLD, but there is also Undertale, some other thing that I can't really remember... I also think, not sure, that magicite was made with gamemaker, it has some of the tell signs. Otherwise I think that Unity is the one, it's problably the most known one today.
We been using Unity for the last five years at the place I work. I don't mind working in it. It's not the best optimized as the engine is pretty general for making any type of game. But it's not like a game automatically takes years to make because of it. Been using from anything as small 2D gamejam games made over a day to the current project that is a 3D vr game.It might be a bit of a learning curve but once you get the hang of it it's pretty quick to make stuff in it. The community around it is really active as well and there is plenty of resources to look up.There is also Unreal engine, never used it. From what I heard it's really focused for making fps and a bit of a hassle to use if you want to make something else.Also gamemaker, haven't really used it much. But I'd put it somewhere between Unity and Rpgmaker as it's pretty open to make what you want and got the visual coding part of the rpg makers.Then there is Pico-8, probably not what you're looking for as it's really limited to the amount of memory you can work with. It's like coding for an old console but with lua instead of assembley. It's fun but not really feasible for making larger stuff in.
If you know some C#, then Unity is right up your alley! I've released a game to the appstore/play store using Unity myself.There are tons of tutorials and guides online to get your started, and you can buy components from the store if you need. Although I've never bought anything from the Unity store myself.It's a free engine, and it's much more powerful than most others, especially RPGmaker. Really, you should give it a shot.