In one word: Python. Because Python is so easy to learn and work with, it makes the code look clean and improves its understandability. Also, there is an array of methods that could be leveraged to perform basic operations like changing the font, adding beautiful colors, designing your game, etc. It is simple to learn, uses optimized C and Assembly code for core functions which makes it run fast without lag. It's free and an open-source Python library so you can also contribute to the open-source community to help build new features for this library.

It's simple to learn, and very fun to develop a game. I enjoyed the process a lot.

It is quite user friendly and easy to implement in terms on animation and the controls which can be added with medium level knowledge of python language