Will my iPhone become slower if I download Vice City?

I have an iPhone 5 16G, and I'm thinking of downloading Grand Theft Auto Vice City.
Since the download is almost 1G alone, will this slow my iPhone down?
I currently have 11.7G available, but obviously will be using more later on.

Added (1). The app costs like $6, which isn't much but it's enough for me not to experiment with it. If anyone has the same phone in the same situation let me know if it runs fine.

Probarly not since you have an iphone 5 which has a faster proseccesor than all of the older models. If it seems to be slowing down your device just delete the app and restart your device and it should return your iphone back to normal. It is just an app so it shouldnt cause damage or anything to your device

No it just depends on how much memory you have but it should be okay.
And if it goes slow uninstall it