Will I still be able to download it even though it's not on app store anymore? If so then I guess they still hold the files online or purchasers?
There's two kinds of removal from the App Store. One way leaves the game in your purchase history even though it's unavailable for new purchases. The other is getting it completely removed from sale and re-downloading, but I've rarely seen that kind of purge.
You should still find it, but note that searching your purchased history won't help, you'll have to scroll through the entire list until you find it.
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