汉字 reader here! (although I'm probably only at grade 3 level)
I've never seen any web-based word games like this for Chinese, so this is really cool to see!
In my opinion, the core game-part itself feels more like a matching game than a language-learning game. Once any hints are revealed, there's usually only two remaining characters that match the current stroke pattern/positioning. This makes it pretty easy to guess the correct characters starting off with a single random click. One way you could make this more challenging is to only reveal the matching stroke elements, but not necessarily their physical position in the answer word.
While playing, I was confused by how strokes, radicals, and components got differentiated. One specific instance of confusion was that the ren2 radical (亻) doesn't get revealed when guessing any character that contains a shu4 (丨).
I've noticed that in games that include characters with shu4 and heng2 strokes, guessing any character with those two strokes often reveals a large chunk of the answer. Maybe that's a strategy that when realized, actually helps people learn? I don't know. In any case, here is a recent game I played: https://git.sr.ht/~yfxu/images/blob/master/hanzi.webp
That said, being able to see the full word at the end with the pinyin and definition would be pretty useful for a learner (I learned a new word!), but I don't know if it would be nearly as useful as flash cards would be.
At the end of the day though, I still think this is a cool game, and I bet figuring out how to hide and reveal specific components of the characters wasn't the easiest task aha, thanks for making and sharing this!