So I've decided to give game development a go. I have experience on php/html/css/sql/js(jquery) so learning a new language shouldn't be as hard.

I was reading that python and javascript are both nice for simple 2d non-intensive games.

I found that python has this library/engine called PyGame but I realized that it was last updated 4 years ago. People still use this?

And for javascript, I found libraries like 'pixi.js', 'melon.js' and 'cocos2d'.

My goal is to make 2D games that would require the same performance as terraria, realm of the mad god, castle crashers.. and all those types of games.

Taking into consideration, that I do want an updated library, what language of this two would be best to choose and what library to grab for it?

Thanks in advance, sorry if question is broad. Let me know and I can edit to add more.