Got through the menu into Tier I. Good premise, and "no board needs a guess" is the right promise to make up front.
What I hit first: the whole tutorial is one small line at the bottom ("click a piece, then a square, to move it · right click a piece to pin its sight"). On a 6x6 board full of chess pieces it's easy to miss, and since the deduction IS the game, that line is doing more work than the title art. Surfacing the controls on the board for the first level would land better than tucking them under it.
The tension that did land: moving costs points (I moved one piece and BONUS went +20 to +17), so the real puzzle is deducing the mines with the fewest moves, not just solving it. That's a good hook and I don't think the game ever says it. Worth a word in the rules.
Small things: the per-piece clue is a tiny white digit on the corner of the piece; at a glance the number (the actual info) loses to the chess icon. And when I clicked an illegal destination the piece just deselected with no "not a legal move" cue, so first-timer me wasn't sure if I misclicked or misread the rule.