Excellent game, congratulations!
I really enjoy the game mechanics. However I think there are a couple of light issues. So far I played only 4 games: 2 in easy level, 1 in normal and 1 in hard. My last game was in easy level and lasted about 2 hours (I stopped because difficulty doesn't increase and I got a bit bored after such a long period
The first issue concerns the difficulty that doesn't increase after a while, at least in easy mode, but I guess it's the same in the other modes.
Nothing forces the player to increase the price of the sushis. So I just stop at a price of 100 for each kind of sushi, which makes the math part very easy. After 2 hours of play, the sushi price is ridiculously low compared to the money waxy makes (I made ~ 1 100 000 000 yens in my last service, before stopping). As the speed of coming orders is also limited, there's no difficulty increase coming from your current level (I stopped at level 988 816). So this gameplay balance is for me the biggest issue so far.
Now there are a couple of technical issues resulting from long plays such as the one I described. For example, when activating the extra money bonus (the one with the Yen symbol), so many coins are generated on display that my computer lagged for more than 90 seconds on my last bonus (I have an Athlon x2 6400+ / 2 GB / GeForce 8800GT). This is already a bit annoying, but as your computer lags to display all these coins (a upper limit would be welcome
), the music continues normally. Actually the music even ended while I was still lagging from my bonus, and I played the remaining 3/4 of the service with no music at all. This makes a bit hard to spot when the end of service arrives (as we have to look at the clock and can't relay anymore to the music indication).
That's pretty much it!
Of course, fixing the difficulty balance will hide the technical issue I mentionned, but having a limited number of coins generated when bonus are spawned would even be better.
Oh and congratulations for allowing scores higher than 2^32.
I played to go beyond this 32bit limit to see if you had a bug on this one, but it ran perfectly. You can find below 2 screenshots: one when it lags with the bonus and one I took just before testing the 32bit limit. I stopped playing the service after.
Again, these are small issues, so congratulations for this very good and really polished game!!