This Steam Forum post outlines how developer 3 Sprockets is dealing with unhappiness at how the game was marketed showing gameplay that could only be enabled through in-game purchases, saying they will make all the themes and skins shown in their prerelease screenshots and trailer free:

1. All skins and themes that we use in our store page screenshots and trailer will be permanently free within the game.
2. For the duration of our launch week sale on Steam, all new and existing Cubemen 2 customers have a "GET FREE GIFT" button in their Customisation menu where they can claim ALL of our current skins and themes for free.
   
   This button will disappear for everyone next week, so update and click it soon!
3. We will be fully refunding every customer that bought any of our in game purchases since we launched. We will be processing these over the next few days, and we appreciate you patience while we work through the rather long list.