I have been informed by Steam that if you fit any of the 3 following criteria you should now have received refunds:
1) You purchased the game from the 29th April onwards
2) You purchased anything from the in-game store regardless of time
3) You purchased a Founders pack and were eligible for compensation for the Atlas Coins which were originally promised.
Please check your inbox from an email from Steam/Valve with more information.
Any issues contact support @ support.bossastudios.com