Hi, I'm David, and I made a few games and somehow they got big enough to actually have fans! Still blows my mind, but here we are, at a merch shop. Because it's just me, I utilize a service called Printful which creates and ships made-to-order goods like the ones here. I've worked closely with the team there to make sure the posters and apparel are high-quality, but I thought you should know in the spirit of full disclosure!
In the rare situation that you receive a low-quality product, let me know and I'll help you out! For returns, you simply return the product to the address on the package slip. Once Printful receives your return, I'll then contact you via email and we'll go from there.
With that said, it's way easier to only order once, so double check that the size you're ordering will work for you! The brands provided here are true to size, and they don't go too small or too large.
If you have any other questions, just go to the Contact page up top and send me a message. Thanks everyone!