When comparing CopperCube vs Shoot 'Em Up Kit, the Slant community recommends CopperCube for most people. In the question“What are the best 3D game engines?” CopperCube is ranked 15th while Shoot 'Em Up Kit is ranked 55th.
Specs
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Pros
Pro Allows creating 3D apps and games without programming
Pro Good 3D editor
Includes easy to use 3D editor for quickly clicking together 3D games.
Pro Native WebGL support
Can create 3D games as real WebGL apps, running inside websites. Doesn't use a cross compiler, so WebGL apps are small and download quickly.
Pro Good terrain editor
CopperCube includes a terrain editor. Terrain can be drawn with height painting tools directly in the editor, textures can be painted quickly with automatic texture blending into the terrain. There are also tools for placing grass and bushes, and for distributing meshes automatically over the terrain.
Pro Exports to irrlicht
It was also written by the founder of irrlicht, although it is not open source.
Pro Available on Steam
CopperCube is available on Steam It was Greenlit.
Pro Easy to learn and to use
Pro Fast prototyping
You can quickly develop an experimental working model of the product (prototype), because the engine gives you access to a lot of prefabs, plugins and settings. And, you can use the visual programming to speed up the process, even if later you have to write code in order to improve the final product.
Pro Oculus Rift support
Supports both DK2 and DK1.
Pro NPC Generators
Control NPC spawning position, frequency, maximum enemy active at once, and maximum enemies created by the generator.
Pro Support for user-created HLSL shaders
Both model and post-process shaders.
Pro Great for shoot 'em ups
The name fits the functionality.
Cons
Con Lacking some details
No information on file formats or codecs in the manual.
Con Tutorials are too short and too old
The only real tutorial videos are 1 or 2 minutes long, and date from 2013.