Whoops, «GUMPY20» is said to be expired.
Viewing post in Playtiles Game Development Kit Announcement! comments
No worries, I didn’t confuse the two! The Playtiles site still says “Available now for pre-order, shipping Q4 2025. Download key sent once pre-orders close.” below the “Start creating games for 33€” button, and the website title (shown in browser tab) says: “[…] Pre-Order now” so I assumed… well, that the pre-order phase was still active.
Oh yep, they must have ended the deal without updating the site perhaps. I actually didn't know it no longer worked until you commented. I have updated information on my end to reflect the change. I'll talk to the Playtiles team and notify them that there is some confusion around the GUMPY20 code. Thanks for bringing it to my attention.
EDIT: I have spoken to the Playtiles Team and they will renew the GUMPY20 promo code for a period of time. I'll update the window of time it will be active once I receive that info from Playtiles.