this is because the menu is rendered as part of the environment rn, the idea was to have something like the interface in Dead Space, integrated with the world itself...I also agree that its transparency and brightness makes it difficult to read; note this has been brought up many times, it's recognized as a design flaw and will be eventually worked on, in time...on of the issues of being a one man army dev is that things tend to pile up, for now it's functional enough, when the core features will all be done he'll move back fixing these things...
Or, you know, if his Patreon blows up to 10k a month and he'll be able to afford help, stuff will be done quicker...