Since you are still in beta, I figure you could use some feedback, so here are a couple of things I noticed that were unexpected. (I'm using Firefox 55 on Linux so some problems may be related to that.)
* After loading the editor, I got a dialog that says "A new version of Construct 3 is available! You are using r58, and r58 is ready to use." which is quite confusing. Also, the text in the dialog can't be selected, so I had to use the dev tools to copy the text. At least clicking "Update" didn't send me into an infinite loop.
* When opening one of the featured projects (I tried Glokar), there is no way to cancel the download. (I was getting very low download speeds, maybe because I'm in China. The GFW throttles a lot of random traffic.)
* In a box that says "Add action... Add..." I would expect the whole box to be clickable, not just the text.
* When clicking on an action like "Go to Mission Objective" I would expect a link that lets you look at "Mission Objective". Yes, it's in the project panel, but maybe I didn't see it and I don't know where it is because I'm looking at someone else's project. Same for all other kinds of cross-referenced objects.
* I found the Beginner's Guide much too late, because it was below the fold for me and the list of demos captured my scrolling.
* Double-clicking empty space to add an object is absolutely undiscoverable. I guess it's fine if you are reading a guide anyway, but I just wanted to jump in and try out things.
* The tiled background editor should show the tile as it actually tiles, otherwise you won't know how it will look. Also, there is no obvious "I'm done" button.
* When you have multiple identical sprites but decide that one of them should be different, there is no obvious way to turn it into its own type so that it can be modified independently. (Short of deleting and recreating it from a clone of the original sprite.)
* None of the preview options seemed to do anything.
That's about when I lost interest.
The concept of your visual editor seems overall quite good, although I'd want keybindings for everything.
* https://www.construct.net/make-games/free-trial says "Make games on your Mac". I don't have a Mac. If you hadn't mentioned that it's browser based, I would've left immediately.
* After loading the editor, I got a dialog that says "A new version of Construct 3 is available! You are using r58, and r58 is ready to use." which is quite confusing. Also, the text in the dialog can't be selected, so I had to use the dev tools to copy the text. At least clicking "Update" didn't send me into an infinite loop.
* When opening one of the featured projects (I tried Glokar), there is no way to cancel the download. (I was getting very low download speeds, maybe because I'm in China. The GFW throttles a lot of random traffic.)
* In a box that says "Add action... Add..." I would expect the whole box to be clickable, not just the text.
* When clicking on an action like "Go to Mission Objective" I would expect a link that lets you look at "Mission Objective". Yes, it's in the project panel, but maybe I didn't see it and I don't know where it is because I'm looking at someone else's project. Same for all other kinds of cross-referenced objects.
* I found the Beginner's Guide much too late, because it was below the fold for me and the list of demos captured my scrolling.
* Double-clicking empty space to add an object is absolutely undiscoverable. I guess it's fine if you are reading a guide anyway, but I just wanted to jump in and try out things.
* The tiled background editor should show the tile as it actually tiles, otherwise you won't know how it will look. Also, there is no obvious "I'm done" button.
* When you have multiple identical sprites but decide that one of them should be different, there is no obvious way to turn it into its own type so that it can be modified independently. (Short of deleting and recreating it from a clone of the original sprite.)
* None of the preview options seemed to do anything.
That's about when I lost interest.
The concept of your visual editor seems overall quite good, although I'd want keybindings for everything.