if you're on a strict webapp diet, https://microstudio.dev​ it's pure 2d, lua focused and has all the instructions on browser.

If you can pay for the subscription, construct3 is unmatched on the browser for easy and fast 2d development

@gusfoca basically the reasons in the post: easy to use, fast to make a game prototype. Construct3 has thousands of premade “logic blocks” that can replace dozens of lines of code and has a bit of everything for 2d game making: physics, tilemap support (can be improved with javascript plugins), helpers for both top down and isometric tile placing, UI layer tools that are easy to place and fast to hook with logic to see how the buttons and bars react to the game content, etc.

Microstudio is MUCH simpler in terms of features, but it uses lua to direct its logic, so whatever it has there you can reach fast and with very little boilerplate code

@Helen Garcia @Sushmita Roy That's just for GUI/UX Experience. what do you use to prototype the game mechanics?