Defold vs ct.js

Defold uses Lua, which is regarded as an easy to learn language by most.

You can invite friends from the dashboard and create games together.

Software and online dashboard are free of charge.

You can do a lot with drag and drop, but you're not limited -- the code (Lua, which is easy to learn) allows you more power than just visual editing usually gives you.

Going from idea to result is very important for the creative process.

Being crossplatform it is important to work on low end devices.

A very active and friendly community in forums.

It allows you to change scripts in a game while it is running live. Common use-cases is to tweak gameplay parameters or to perform debugging on a running game.

ct.js is bundled with examples, docs, and easy to follow tutorials. Documentation and tutorials are available in a side panel on every screen.

Starting with v1.0.0-next-1, you can now write WebGL games. WebGL support is based on Pixi.js.

ct.js supports tiles in rooms, including collision checks and some extra editor tools, like bulk migration to a new tile layer or shifting by an exact value.

ct.js aims to be a general game engine and provides tools in making games of any genre.

The built-in code editor comes with error checking, code completions, multiple cursors support, and other modern features.

ct.js has a "Core" library that provides basic drawing functions, room and asset management, and mouse interactions. Any other functions are added to projects as "catmods", or simply modules. These modules can be enabled or disabled in one click, and can inject their code in different game loop stages, e.g. after drawing all the objects, leaving a room, or when a new object is created.