It's funny. In most situations, the business thanks the customer not the other way around. Can't remember the last time I walked into Walmart and thanked them from the bottom of my heart for waking up at 4am, keeping their shelves stocked and having cheap prices.

I feel 'bottom of my heart' is a little overkill for your sentiment. A "Thank you for all your hard work" would have really got the message across, but when you add 'from the bottom of my heart' it makes it seem like you hold an unhealthy connection to the brand of Square Enix and/or this dev team.