Price aside, the free version feels like it could benefit from easing up, just a bit, not enough where someone can make a fully-featured game, but enough that you could get somewhat far and then need to subscribe.
Events are tricky, I think a limit is a good idea, but maybe a bit higher for logged in users. Sure, you could say "ah then they should learn to utilise loops and such to keep event count down", but maybe people won't think that and just abandon when they hit limits.
There's an effect limit of 2. Just 2, for the entire project! Gives you a quick taste but doesn't let you make a small effect system, could add blur horiz and blur vert and you've reached the limit. Maybe a change to this, maybe 2 per object, maybe a global limit of 6 - sometimes combining effects is quite important.
Remote preview is restricted, perhaps this could be unrestricted for logged-in users, as its quite exciting to preview on mobile and such. Could say that people could open on their phone and test, but seeing popup is just another "uhhg" moment if testing on a desktop.
I guess my thought process is trying to find a way to get people using C3 a lot and getting quite familiar, without hitting restriction popup and such as easily. Then it's like "I've spent few hours and just hit a restriction, I really dig this, let's sub" rather than "ahh man I've hit a restriction multiple times and it's been 20 mins".
Scirra would have more useful data on all this so I imagine they know whether popups on free version causes the person to quit suddenly or something. But just some thoughts.
The example page is definitely amazing, even on free version, you can still open anything to see what sorts of things you could make with C3. Maybe a good "tech demo" kinda like kiwi story but does some crazy showcase of everything (physics, effects, etc) kinda like how half life 2 had that map they showed at E3 showing off essentially EVERYTHING that can be done in one small sweet package. The examples definitely do this, maybe even a highlight of the very impressive ones for free users to be easier, but a self-contained project with everything could be great!
EDIT: Infact, when I open C3, I see first person shooter, cave bridge, and challenge room, none have touch controls and don't say to flip to landscape. Why not have these update to have this? The cave bridge is an excellent demonstration of how beautiful C3 stuff can look! But all in all, if free version always presented a wonderful tech demo example that works on touch, then even people casually browsing on their phones could go into the editor and immediately preview a beautiful professional-looking project.