Unity is the ultimate game development platform. Use Unity to build high-quality 3D and 2D games, deploy them across mobile, desktop, VR/AR, consoles or the Web, and connect with loyal and enthusiastic players and customers.
In Unity Assets store you will find very interesting free download assets that will help you a lot to develop your game:
GameMaker Studio 2 is the latest and greatest incarnation of GameMaker! It has everything you need to take your idea from concept to finished game. With no barriers to entry and powerful functionality, GameMaker Studio 2 is the ultimate 2D development environment!