• Ruminant's Whimper Wiki (JP)
• English Hellsinker new player guide
• Hellsinker steam page
• BOOTH page for Tonnor/Hellsinker
• Ruminant's Whimper Website (JP)
• Hellsinker thread on Shmups Forum
• Scoreboard and replays
• Article I enjoyed about the game
• Translated Hellsinker interview with Tonnor.
• Not linked here, I also recommend checking out the offical english instructions. Click the "Open instruction folder" button on the Hellsinker launcher and open guide_en.htm