As someone who works in the linguistics space and has worked with numerous teams on games and has a wealth of knowledge on how people actually learn vocabulary and what they actually find fun when doing so, I feel like this game would benefit from a pause, a rethink, and a redo. I am in the middle of a Covid bout right now or I would say something more substantive but perhaps most important: you already have valuable feedback here you seem to be rejecting. Why? For example, what if you did allow multiple answers in the blank and scored accordingly?