I've been developing games for 4+ years and can make on any platforms. I use Unity for development and I use photoshop, illustrator, blender and 3ds max for graphics. I can also do sound & music but price can go higher and lower depending on the scale of the project. To give an example, a 2D mario-like platformer mobile game without any significant music, with only basic and necessary sound effects may cost 50 per hour depending on its simplicity.
Feel free to contact me for any of your questions.