That has happened quite a bit in the past but it's not all that predictable. I've also had a few months with good sales in the first 5 days, probably the same reason. Also used to get far more sales at weekends but that seems to have changed too. I think the summer/holiday period may have something to do with it. There's also the common observation that the summer/warm months give much slower sales compared to winter times. However, I've had all these predicted trends go wrong on me from time to time so it's best not too think about it too much, and just get sales growing come rain or shine
I hope you're wrong! Seriously, though, the game had some annoyances and a critical technical glitch (no sound for OSX 10.4 users), so I think those things really did hurt sales. I'm not fiddling with the gameplay because it's solid IMHO, but I am fiddling with making it all more obvious and easy to play. I just updated the game, so we'll see if it helps any. If not, I'll probably write it off as a loss and move on. Thanks for your comments! I'm certainly learning in a trial by fire here....
Pavlinarising a game that has already got it wrong (no mouse control, too hard, bad UI etc) will work wonders I'm sure. But quite a lot of us build that into our games these days, so once we are done, there isn't much else that can be done to change the CR significently. So Pavlinarising does help, I'm sure. I would do more of these tiny updates and test for CR changes, but I don't have enough traffic to measure my CR properly so it's hard.