Yes. You will receive a design draft of your store and can get a full refund if you choose not to proceed with the developer. Once you give the developer the green light to start coding, refunds are proportionally based on the readiness of your store.
Are revisions included?
Yes. The developer continuously listens to your feedback and implements it. 10 free revisions are included. Further revisions are at the discretion of the developer.
Are there unmentioned fees?
No. However, a Shopify subscription is required to keep your Shopify account running with the store. It starts at $1/month as a trial. There is no contractual obligation to prolong it, but then you lose access to your account/store.