You can try some of the solutions here if you still need them. It looks like the first issue, which I thought I had fixed but apparently not. Apple has made some changes in recent years which have broken things and it's difficult to keep up sometimes. I'm in a really awkward position in regards to Mac support; I know some of potential audience is on Mac but it's really hard to support a platform without being able to test on it.
The posters are one of the awkward parts I alluded to. Those are super hacked together using a system designed for subtitles and just waiting for the usual interact key. In retrospect it was probably too much to just throw up on screen like that without some sort of better system. The reason I didn't use full dialogs for those is because I felt it would break flow too much, but it would have been much easier to read. Early on I had ambitions of having voice acting, which would have helped a lot, but that was never all that realistic a proposition.
Unfortunately I don't think The Last Magical Girl is ever going to happen. It's definitely not going to be a jam game; the scope is just way too big for that and that's why I abandoned it this time. If I have a brilliant idea on how to do something simpler along the same lines it might happen. But as it stands the huge scope of it is honestly really daunting and I'd much rather do something smaller.