how does the price calculation per mobilego works?

I understand its total raised divided by 100m

but the total raised value, is it gonna be at the time of ico ending or the time of investing?

Suppose, i bought 1 btc worth game and got 1200 gamecredit and innvested but then when ico ends , game price is low and the 1200 worth 1 btc(1280$) are not worth 0.8 btc(1000$)

so do i get 0.1 usd per mobilego as per 1000$ that i invested or 1280$ that i invested??

Please answer and let me know if my question is confusing