The problem with these things is, they show you screenshots of the types of games you can supposedly make, but that is literally nothing to do with the game engine itself. That's art assets, which are a whole other ball of wax.
Most of these games, the programming itself is trivial. If you can't hack it together in Java without a game engine, then you're not going to be able to hack it together in the game engine.
If you want to make casual indie games that look great, you need to be focusing on your artwork, and how to make artwork that works well in games.
And for the love of god, do not neglect sound until the last minute. Good sound in a game can be as complex to create and program as graphics. You absolutely must develop it in tandem with the rest of your program. We are so focused on visuals, but bad sound will ruin a game more certainly than bad visuals, just as bad sound will ruin a movie more certainly than bad camera work. Bad visuals could be a stylistic choice, but bad sound never is.
Most of these games, the programming itself is trivial. If you can't hack it together in Java without a game engine, then you're not going to be able to hack it together in the game engine.
If you want to make casual indie games that look great, you need to be focusing on your artwork, and how to make artwork that works well in games.
And for the love of god, do not neglect sound until the last minute. Good sound in a game can be as complex to create and program as graphics. You absolutely must develop it in tandem with the rest of your program. We are so focused on visuals, but bad sound will ruin a game more certainly than bad visuals, just as bad sound will ruin a movie more certainly than bad camera work. Bad visuals could be a stylistic choice, but bad sound never is.