This is proof that you've reached the maximum Blast Gauge of 9. You can increase your BG using the Stack 3 bonus skill "Blasst". Coordinate your equipment just right, and you can blast off to new heights.
This is proof that you've equipped items that activate a Stack bonus skill. You can get Stack bonuses by equipping more than one copy of the same skill at once. The more copies of that skill you equip, the cooler your Stack bonus will be!
Shop Level will increase when you buy, sell, or fuse equipment at shops. This is proof that you've fist-bumped the invisible hand of capitalism enough to achieve maximum Shop Level. Secret menus unleashed!
Either on (at least) your 2nd playthrough or in Hard (or greater) difficulty, conquer the fierce battle at Morgause, the Shrine of the Earth Trial, without using any items!
This is proof that you've reacquired the equipment you carried over from your last playthrough in Lakehaven Heights. Future You is cheering you on, waiting to meet you at the end of the game once more.