There are a few factors that can influence this, and it can depend on how the seller’s account is configured (Are they the merchant of record or is itchio)
Generally speaking, for purchases where itchio is the merchant of record, “ITCHIO GAME STORE” appears on the card statement. Depending on your card, there may be a “Details” section on your bank’s app that will show a full line item that may include the product name and product creator.
Some creators though may be operating their own merchant account, and what is displayed on the statement depends on how they have registered their business with the card processor.