Hi Floris! We are glad to hear your proposal about working on our game's music and sound design. However, this project is something we will not continue working upon as it is simply a project we made for our school homework. We are happy that you have found our project interesting enough for you to offer your help and we really wish we could have worked with you. 
Also the issue with the mac is very sad to hear. Since we don't have any mac users on our team we can't test the files out. Can you tell us more about the issue you're facing? If you could tell us the exact error its showing, we could try to fix it asap. 🙏