Just as AndrewMBaines is mentioning, I as well, really like the new changes.
I came across a few things worth bringing up:
I LOVE that you have added this feature and that you can specify what type of join it is, though there were a few things that disappointed me.
you can only join to the main table and not between different tables is a bit sad, and to be honest not that useful in the long run.
Sure you can then add a join on the previous result, but that just created yet another subquery which isn’t ideally for perfomance.
A great addition to this would also be that you have the ability to select which columns you want in the query before visualizing the results.
You could easily end up with a lot of un-needed columns in the initial query, which could end up in a performance issue, just to remove them again.
When clicking on the tutorial (nice small addition) the page becomes unresponsive and you need to close the page or go back through the browser to continue working.
Over all I must also say that I REALLY LOVE this approach you guys have taken and really do see potentials for it, unfortunately, just a few things that could be improved.