1 million is low?
Say 1 year to dev. A bit short from where I sit but if it is a port of sorts then so be it.
Not going to be too much so comparable late stage 3ds game
http://www.mobygames.com/game/3ds/cooking-mama-sweet-shop/credits
Some are dupes but 20 people sounds about right.
It is game industry so no need for big boy salaries and a top tier dev there probably gets paid what some java dev gets paid in the real world. I don't know where they are at these days so I can either do UK, fumble with French or some kind of US costing (
https://www.indeed.co.uk/Java-Developer-jobs
Call it 40 grand a year per person (by the time you paid pensions and other such taxes it surely will be, that also assumes you can con the whole team into such salaries -- accountants, HR and such tend to know what they are worth, on the other hand the £20k extra which goes to management you can probably take from your starving artist).
40000x20=800000
Office space.
20 person cubicle farm for a year.
http://www.flexioffices.co.uk/essex/colchester (not quite London but not in the sticks either).
You are doing well to pull off £200 per person per month.
200x20x12 = 48000 . Done with something other than flexi offices you might do better
No computers, no voice recording gear, no switch SDK but we will assume that already exists and does not need upkeep or replacement.
We are about £850K there. That is GBP which is quite an expensive place but the US (either California or New York) or France are not know as being cheap places to operate. Converted to USD that is 1.2 million at current rates and the GBP is in the toilet right now.
This also assumes no advertising. It is a rather large portion of such things. That said maybe they work it such that if after a year there is nothing to show it is only the silly crowd funding investors which get burned.