Looking for feedback for my MVP

Hello everybody,

I am new to indiehackers and also to the world of entrepreneurship. I have been working on an MVP Lingua-e www.lingua-e.com for some time. Lingua-e is a website to practice English grammar and vocabulary exercises.

It's a freemium + subscription business model, some exercises are for free after you register, the rest of the exercises are under a subscription model.

So far it's targeted for Spanish native speakers or advanced users who can have the interface in English.

I know the registration requirement might be a turn off. So I am working on adding a video demo in the landing page. Other than that, I am looking for feedback on how to improve the design, the landing page, the value proposition or anything you can think of.

Any constructive feedback is welcome!

Thank you so much for your time