This is really nice and well-made! I personally don't really like luck-based games and gambling games (wtf am I joining this jam), but this game really caught my attention, and I think this is actually one of the better games I've played this jam! What a hidden gem this is. It matches the risk theme perfectly, and it's that kind of "salvageable" risk I liked. The game is basically a math game in disguise, where you are just calculating the way to victory. The graphics are also really appealing, and the sound design also felt good, though if there were ambient sounds, it would have been better. I still don't understand why there's even a negative multiplier coin, and most multiplier coins are really useless in later stages, but I really like the fact that each coin has different abilities. And to top all of that, the gimmicked coins mechanic is just perfect. Well done!
For some criticism, I think the game would really need a retry button, where it would be best to just reset if one's doing poorly in the first few levels. I need to F5 the page currently to do that, and it sucks. Also, a level count would be nice too. I would also hope the biscuits can do a bit more, though, as of right now re flipping is nice, but it would be way more cooler and tatical that you could do more manipulations with the biscuits you've earned.
Anyway, this is probably one of my top picks in the jam. Try asking around more (or rate 4 rate, but I really dislike that) and try making the 20 ratings! Good luck!