Today, The Battle Cats on 3DS reached 200,000 downloads. Time for an updated sales analysis
May 31st - launch
June 26th - 100,000*
July 11th - around 140,000**
August 6th - 200,000
Amount of days to reach 100,000 - 27 days.
Amount of days to go from 100,000 to 200,000 - 41 days
First 100,000 in 27 days --> 3,703 per day/25,925 per week
Second 100,000 in 41 days --> 2,439 per day/17,073 per week
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Amount of days to go from 100,000 to 140,000 - 14 days
Amount of days to go from 140,000 to 200,000 - 26 days
40,000 in 14 days - 2,857 per day/20,000 per week
60,000 in 26 days - 2,308 per day/16,154 per week
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Going by this analysis, it seems the game's sales pace has decreased since the first month, and it's still decreasing, but very, very slowly, especially considering how surely the debut week had higher sales than the first 4 weeks' average.
This can give us some indications about how new entries (both digital only and retail + digital) have been doing on eShop in the past weeks, at least top new releases. Remember: eShop Charts have a different criteria to track sales, since they consider sales between 2 weeks prior when you check them and the exact moment you check them. For example: if a game, right now, is first on the eShop, it's not just because it's currently doing better than any other game, but it's because its sales have been higher than all the other games between July 23rd and today, August 6th.