Sorry was considering writing my own post but didn't want to litter the forums. Here's my thoughts on the pricing model.
In summary I think that the free version (considering the competitors, defold and stencyl) are too prohibitive for casual and curious users.
I am completely new to Construct and was seriously considering picking it up. At 99 dollars a year it's not a price point that I can justify however. The subscription doesn't bother me but the fact is I can fully prototype a game and get it up and running without publishing it (because let's be honest that's not gonna happen for some time as a casual user) absolutely free on other platforms.
For people like me, free tools are essential. If they're not free I'd consider paying a small fee (something to the tune of 30-50 but 99 dollars is A LOT OF MONEY.
There is one other major concern here, providing Construct 3 as a webpage changes the perception on how I can use it and how much it should cost. I am not used to paying 99 dollars for access to a website, I don't see myself ever paying that.
There is a free trial, the free trial however is really restrictive. Consider allowing people to use the base feature set free and limiting publishing and addon ability. People will be much more inclined to use your software as it makes the program much more attractive and gives me incentive to learn (remember if I jump in it's a big learning effort to figure out how to make games in the first place, I want to be certain that the platform I choose is a good one)
Consider adding an extra price point with no publishing ability at 30-50 dollars, something I can throw some money at and not feel guilty about. That, or make the free trial less daunting and restrictive.