@jeagon, You get an A rank by completing a level without: Killing too little enemies and, Not getting hit 5 times. S rank is the same, but you can't get hit twice.
You've truly outdone yourself kupo. First games started as a simple fight a wave, boom. Fight a boss, boom. Now you're up to this point with free walking and it seems actually to be like an RPG. I give all my kudos to you.
Seriously, this game couldn't be anymore P2W. You start with a cheap sword, cheap stats, and cheap everything. First you start with a wood sword, and then the next tier is an extremely overpowered sword which is worth about 5$ IRL money. And guess what? They make you want to IDLE for this game to work! I ran out of energy, so I made a fruit basket. I ran out of energy again soon, and it said I HAVE TO WAIT ANOTHER 20 HOURS TO MAKE ANOTHER ONE. This is basically the EXACT same thing as Skyshard Heroes.