I used to be a farmer myself, but I snuffed too much minecraft sugar cane, then I went bankrupt and got rupeed by an enderman and then end of the story.
The tutorial should be telling you to open the Silver chest from the list on the side of the chest screen. You don't open the locked chest as part of that tutorial. You can find combinations to unlock the locked chest through the community, like the game chat, and on our official reddit (linked in the in-game Main Menu.)
https://www.google.com/maps/place/The+New+Church+of+St.+Waluigi/@39.8975949,-91.3831515,5z/data=!4m8!1m2!2m1!1sminecraft+church!3m4!1s0x883811eb631108f7:0x82eb41fe2cd219a2!8m2!3d39.8975949!4d-82.4183081 WALUIGI CHURCH YO
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 "Bullet Heaven"){kind=icon}
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It does not, as Ruffle only supports a small amount of AS3 (the language most flash games use), at least currently: https://ruffle.rs/#compatibility