Although it seems like this should be the final achievement in the game, beating the game with all S-ranks unlocks exclusive equipment that will be needed to unlock the following:
Requirements required for attaining an S-Rank seem to be a bit murky. There is a load screen tip that suggests that weapon and projectile percentages are the most important thing. However, in my experience, I have found what I feel to be a pretty good gauge on what is important.
Firstly, I think that carrots, time, and combo seem pretty irrelevant. Accuracy is definitely a big contributing factor. I found that a 60% accuracy or higher for each weapon set is pretty much a requirement for S-Rank. The other big thing is Health. I don't have an exact number (and it may vary from stage to stage), but I found that you can't have lost more than 100 health in a stage and still get an S-rank.
Most levels are not too tough honestly. The only level that really gave me any fits was 5-2: Throwing a Tantrum, which I will give specific strategies below. For now, here are some tips that should help.Health:
Since I have determined you cannot lose more than 100 health (which is your default), there is no point in wasting any artifact slots on anything Health related (except for maybe the one that allows extra invincibility period after each hit). Instead, you may want to focus on strength or Special meter generation (special attacks not only allow for some decent damage, but gives you a period of invulnerability).Accuracy:
I liked using non-elemental swords such as Ruby Sword. Knives are great for accumulating special meter, but I found that it was harder to maintain accuracy with the knife. As far as I can tell, a dash attack only counts as one attack, regardless of how many enemies you hit. For reasons similar to knives, using Sharp crystals or the feather as your projectile may drop accuracy if you are not careful.
Anyways, with exception of the last couple of stages, I didn't find S-ranks to be too difficult. You can use the video provided by I AM CULLY here:
For an S-rank on the last level.
That just leaves 5-2: Throwing a Tantrum-
The difficult part of this level is that some of your abilities are taken away for some of the segments. This includes waves in which you can use only projectiles.
I found this setup to be amazing for getting an S-rank here:Sword:
Pointy FeathersArtifact 1:
Elemental AmuletArtifact 2:
Projectile WhetstoneArtifact 3:
Huge Stamina Orb
You can replace the sword with something else, but needs to be Electrical elemental. This way, using the Elemental Amulet (gives projectiles same element as you sword) will electrify your Pointy feathers. Now, when a group of enemies emerges, pelting them with feathers will cause a chain reaction shockwave that will cause the enemies to be defeated very quickly. The quick firing mechanism of the feather makes this almost effortless.
The parts with your sword are easy enough. Just keep in mind that the chameleon enemies deal about 14 damage per hit.
The dash section with the laser are troublesome at first, but very manageable once you learn the patterns.
Finally, try not to choke during the boss fight and lead the explosive globes towards to boss as well as you can while trying to avoid getting hit.