Yes, Animotica is essentially a free application. You can access all of its functionality from the app you download from the Microsoft Store for free.
That said, your videos will have our watermark on them and premium features will be locked if you want to download the video you made. You will need to upgrade to the PRO version in order to remove watermark or unlock premium features. This is a one-time purchase, there no monthly fees. After that, you'll get all the new app updates for free.