I've periodically been getting a bug in this game where the graphics would freeze on a particular frame of output, but the rest of the game would function normally (the BGM would continue to play, sound effects would continue to play as expected on keyboard inputs that produce sound, and the game can even produce a working save file if the in-game menu is (blindly) navigated).
https://steamcommunity.com/app/363890/discussions/1/276237094327448139/?ctp=2 <- Based on my searching, this might be the issue; it seems that there's a bug with the RPG Maker core engine that the game uses. The first post on this thread's second page links two fixes; one is an engine plugin that patches in a workaround for the issue with a brief code snippet, and the other is a community alternative to the entire core script.
While saving the game is usually able to act as a workaround for this issue, having the issue patched in this game would make things far more convenient (and avoid annoyances such as having the bug trigger during a post-boss cutscene... where using the save workaround means losing out on reading some of the dialogue).