When comparing ImpactJS vs Phaser.io, the Slant community recommends Phaser.io for most people. In the question“What are the best 2D game engines?” Phaser.io is ranked 10th while ImpactJS is ranked 54th.
Ranked in these QuestionsQuestion Ranking
Pro Extensive documentation available to support development
ImpactJS has an active user community that busily produces tremendous resources including videos, books, tutorials, walkthroughs and more. There are also comprehensive class documentation available.
Pro Excellent collision detection system
Impact provides 2 types of collision detection; static and dynamic collisions. Both of which are easily integrated into game development.
Many plugins are available, including one called Impact++ which adds features like pathfinding and dynamic lighting.
Pro Level editor
Built-in map editor with support for tiling, collision layers, and actors.
Works with Box2d physics library, comes with all worthwhile elements for actors built in.
Pro Truly cross-platform allowing developers to build for anything
Extending the reach of a game developed with ImpactJS is easy due to the cross-platform nature the framework. There are Considerations around performance, resolution and audio, however all can be appropriately addressed when in development. Works in the browser via Canvas, even on mobile. Easily translatable into a packaged app.
Pro Support for Arcade Physics, Ninja Physics and p2.js
Pro Good tutorials, courses and books
There are plenty of great learning resources available for Phaser.io.
Pro Very fast to develop with
Pro Super-simple loading of assets
Pro Great community resources
Pro Easy to learn
Pro Animating is easy
Pro Excellent tools for sprites
Pro Built-in Arcade Particle system
Pro No install required
All you need to do is attach Phaser script to a HTML page even without installing any extensions.
Pro WebGL and Canvas rendering modes
You can choose WebGL or classic HTML canvas element for game rendering
The last update was in 2014.
Con Cost of $99
While most HTML5 frameworks are offered as free open source projects, ImpactJS has a one time cost and no free option.
Con Poor performance
As long as your map is not larger than 600*400px, everything is fine.