[hayst4ck]

I am probably wrong about #2. It's probably too easy if you get the # optimal moves. If you know the number of moves, that tells you how many non capture moves. That is a very strong hint, especially since there are only a handful of real choices per puzzle (at least today).

I don't think I saw the #moves the first time, or at the very least the lack of a try again/try for optimal/try other puzzles button made the page seem terminal. I imagine the share button is prominently there to go for virality.

https://wafflegame.net/archive is a game that is very similar to yours. I like their layout. The archive with a score per puzzle and aggregated information at the top is fairly addicting.

Waffle puzzles give you a maximum number of moves, 5 more than optimal. I like that more than infinite moves with try again. I think "failing" gives attempting more meaning.