If you have C# background. Have a look at Duality.
Duality is a flexible 2D game framework written entirely in C# –
and it’s here to make things a little easier for you. It provides both
an extensible game engine and a visual editor to match. There will be
no need for a level editor, testing environment or content manager
because Duality is all that by itself. And best of all: It’s free.
