This is unusual, I've downloaded the PC itch version just to test out and I'm able to access all content.
Can I ask which device your using? Could possibly be an Android or Mac exclusive issue.
So when I start the game in Itch, it gives me the option of three different versions (I believe they 0.1.3, 0.1.4, and 0.1.5), the issue is that they all have the same name so I didn’t know that I kept playing the 0.1.3 version instead of the 0.1.5 version. Another thing is that it lists the version from oldest to newest, so I kept choosing the version on the top, when the latest version was on the bottom. If you want any screenshots or more information, let me know.