The best alternatives to This is my game are Buildbox, Stencyl, and Construct 2. If these 3 options don't work for you, we've listed a few more alternatives below.
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Buildbox is a new video game maker that is extremely easy to use. Using this video game software, anyone to design amazing games for mobile, console and PC.
Stencyl is a video game development tool that allows users to create 2D video games for computers, mobile devices, and the web. The software is available for free, with select publishing options available for purchase.
PlayCanvas is the world's first browser-based game engine. Build high quality video games, virtual reality and augmented reality applications in the browser. Collaborate in real time with your team. Build - Share - Play!