Make sure that Find the Words is WCAG 2.1 AA compliant.
Some known issues:
It is not possible to answer only using the keyboard
Because of the above it is not possible to use it with a readspeaker. When fixing the keyboard issue take care to find the best possible experience for someone using a readspeaker. It will be challenging. Perhaps list a limited set of options for them to choose from that visual users can't see including a mix of correct and incorrect words like an invisible multiple choice alternative mode for readspeakers. Let the author toggle this mode on and off, and call it "enable read speaker friendly version" with the explanation "Find the word as is will be extra challenging for read speaker users. This option offers read speaker users a version that is more friendly. It is not visible for other users, but computer savvy users may be able to reveal it and thus make it easier for themselves to solve this task."