When comparing Gideros vs Genome2D, the Slant community recommends Gideros for most people. In the question“What are the best 2D game engines?” Gideros is ranked 26th while Genome2D is ranked 46th. The most important reason people chose Gideros is:
Gideros provides on device players for iOS and Android that can be used to instantly try out your code directly from the Gideros IDE.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Instant on device testing
Gideros provides on device players for iOS and Android that can be used to instantly try out your code directly from the Gideros IDE.
Pro Auto scaling and image resolutions
Gideros provides an easy way to target various screen sizes by providing automatic scaling options and choosing the best image resolution based on device screen automatically
Pro Local builds
You can build apps without an online dependency.
Pro Friendly & helpful community
Gideros has an active forum where you can find friendly and helpful advice.
Pro New features and improvements are released regularly
Gideros is being constantly updated and improved by the main developers.
Pro All in one studio, no complicated setup
Gideros Studio is incredibly easy to set up. Once installed it is very easy to create a new project or open one of the many example projects. Trying out an example on the desktop is two clicks away.
Pro Easy plugin architecture
Gideros Studio has a very powerful feature which enables developers to use a C/C++/Java/ObjC library next to Lua. This way it's possible to call the library functions under Lua, get the results and interpret them directly under Gideros Studio.
Pro Supports many platforms
Gideros supports iOS, Android, Windows, MacOS, WindowsRT, Windows Phone and HTML5 platforms.
Pro Amazing 2D performance
2D performance is amazing.
Pro Very easy to learn
Gideros uses the Lua programming language which is very easy to learn (and very powerful). There are some excellent video tutorials too, to help you get started. The Gideros forum community are also very friendly and helpful if you any any problems.

Pro Lightning fast
It's the fastest gpu-based framework out there for flash. It's beautifully optimised. It has very low rendering latency, low level OpenGL calls that other tech simply cannot do (ie Unity) due to Stage3D, and thus can render a lot more data quicker
Pro Cross-platform mobile, desktop and web
Supports Windows, Mac OS X, Linux, iOS, Android, Web and native Flash.
And with the HTML5 export, it also potentially supports development for the Wii U :)
Pro Haxe!
Haxe is a strictly typed programming language that saves development time but still compiles high performance executables, and can build for tons of different platforms (flash, c++, html5, java, c#, etc.)
Pro Access to direct draw features
Has access to direct draw features so you can make you own rendering structures (scene graphs etc).
Pro Automatic dynamic batching
Automatically batch geometries with dynamic batching techniques (by using constant buffers).
Pro Component based architecture
Cons
Con Few resources, but growing
Gideros has a small community, and therefore do not have as many "How to make a game" tutorials. However, there are a couple of excellent books available that can take you through the fundamentals.
Con The Gideros IDE is not as fully featured as other IDEs
The Gideros IDE is not as fully featured as other IDEs, but you can easily use the very powerful and compatible ZeroBrane Studio IDE.
Con Lacks documentation
The API documentation is minimal, there's not many tutorials and the ones that are there are very small and only cover the basics. If you want to learn how to properly use it, you have to ask the community or read the source code and figure it out.
Con Not too many games to showcase it
Con Slow development rate
