In order to get Sushi (the game's money) you have to wait for a special arrow to appear with sushi on it, and if you hit that arrow, you get 1 sushi. I honestly don't like this, I'm sure there's better ways to get Sushi, so do you like the way it is?

I like it because there's more than one chance per level to earn sushi.
I've gotten 5 sushi in one round, and it's helpful, and easier to get currency to buy things.

well, there's not much else you could do

if you award them based on rank, people could play in a private room, and play a 10 second song over and over to farm them

I thought the sushi arrows were bonuses and if you lived to the end of the round you got extra, silly me. I do like this system but it could be improved.

I think it should be every certain notes right you get 1 sushi, or like depending on your score or percentage.

At the moment you can get five sushi per song at max I believe, at least that's the most I've seen. I like the system, but there should be a bonus for getting first. (of course you'd need to make it only count in certain conditions such as the 11+ mice for firsts on tfm.)

I think when you first make an account you get 100 sushi. I feel that is good so you can buy a item or save it up for different things.
I also like how you can earn sushi by getting the sushi arrow. I think is awesome! :3

Yeah
It's fun,
how else would you earn it..?

it takes soooooooooooooooooooooooooooooooo long

A bonus for 1st, 2nd, and 3rd would be nice to have. I like the idea of having more sushi depending on the percentage of notes you hit, not just particular notes.

yes
i like it and it doesn't take long at all
you can get 4-5 sushi in 3 minutes
however in tfm you can get 1 cheese per round (vanilla+normal room = 1-2 minutes + 1 cheese and racing 1 minute + 1 cheese)
and you still earn the sushi even if you die
in bouboum or fortoresse i find it even harder to each currency (potatoes, hazelnuts)