Thank you very much for your nice comment, we really appreciate it!
Although some people encouraged us to offer NIVA for a small amount of money, we decided against it, not only because the game still has some teething problems and we didn't have the time to fix them within the scope of a student project, but also because we felt like offering our game for free matched our vision of the game very well. So we hope in this way we can enable as many people as possible to find a source for peace and relaxation within NIVA.