Need add some hitsounds. From Ranking Criteria's page: https://i.imgur.com/j0wiLgB.png (and https://imgur.com/XWb1YUU). Known cases of failure in the ranking due to lack of hitsounds (740535#164118).
Spread between Tyrant's Hard and Waltz diffs is kinda harsh. Objects density, spacing, rhythm intensity and star rating, of course, is much bigger on the last diff. For now, I don't see any fix except making a diff between Hard and Insane.
Also, diff settings spread between Normal and Hard should be better a bit, for now, AR3 for normal and AR8 for hard seems like it's the too big difference, same applies to OD. The easiest way is to nerf settings on hard a bit.
Seems like there shouldn't be "~TV Size~" in the title field.
Resources: