I'm so glad you had a good time with the game! I'd be happy to clarify~
Re Techniques. They are intended to be used only once per Match. The phrasing could be worded clearer and is likely a carry over from an earlier state where the 1 use/match rule was not cemented yet. I'll make a note to punch each of those up for clarity.
Re 6's High & 1's Low. You got it! Normally with 6's high the hierarchy would be 6>5>4>3>2>1. But in rounds when Fortune's Reversal is used the hierarchy reverses with 1's high like so 1>2>3>4>5>6.
Appreciate you letting me know your thoughts and speed-bumps with the game! Hope you're able to have some more good fights with it <3