I agree that this is a very different type of game than Wordle, and I probably shouldn't have invited comparison by comparing them myself in my above comment. You make great points, and I have struggled a bit with the best way to "score" the game. Time seemed easiest, but I thought a bit about number of clicks as well.
LINKR does have a hint button, in the top right like a plus symbol. It will show you connections that you have correct. But using the hint button won't increment your score in your stats page.
There is also the "compare" button on the stats screen to show you the daily averages for each puzzle - I'd be interested in your feedback on that? Especially if you didn't interact with it, maybe its too subtle and I should make it larger.