One quick bit of feedback - i'm not as likely to try it out if i have to register first. Create a demo area where i can play, but not save and use that as bait for registration.
There are some hard to answer questions around the type of users that need dynamic pagebuilders, and you need your paid tier to target the specific pain points of people who would pay, not just arbitrary limits on free feature usage. I built the platform for free users so that's all I ever attracted.
If I did it again, I would focus on things businesses need like product widgets, contact forms, store maps, opening hours, social integration and so on.
I don't know how they're going to use my email. Are they going to send me useless emails in the future even if I decide that I'm not interested in the product? Are they going to make me confirm my email instead of letting me right in to try it? If I don't like the product can I delete my account or do I just have to forget about it?
I like when I can try out a product with as little friction as possible. To be completely honest when this happens it can sway my decision to use the product.