Hey I know I’m hella late but I was wondering how to get the third flower for the bouquet quest? I can’t figure out how to get to it.
It's in the third room of the second level of the Deep Mines. You can check the walkthrough for more details. 
0.21.1 is the most recent public version of the game. If you're playing that, you've already reached the end with Richtor's fight. If you wanna support Spedumon on Patreon, the latest version there is 0.81 (the Patreon version has a different numbering system than the public version, it's not 60 versions behind). Otherwise you gotta wait til November for the next public update.
In order to keep your save files, you must copy the entire "save" folder within your current game's folder (which is inside the "www" folder), and use that to replace the one in the updated version.
You need to finish each repeatable Quest Guild quest in Piratetown at least once (all nine of them, you'll need the golden badge for the 3-star quests). Then Buba will ask you to talk to Vulfox in the guild lounge. You can check the walkthrough for more details. Sword is the leader of the royal knights you met in Safen at the beginning of the game. So far, there's no use for the key yet, both in the public and the Patreon version.