Well I guess the title says it all… Im not 100% sure but i think google play has the same “problem”.
Im guessing that the games are indeed smaller than 100mb and that the size shown in the appstore is the installed size on your device, correct?
Some games will download a small ‘installer’. Game data is then downloaded from the net when you run the game. Asset bundles are great for this.
Here is a reference on how it is done with Google Play.
If you use Google Play to host the additional game files, then the users settings on whether to download over cell network or not are automatically respected. If you host the additional files yourself, and download them in your app, then it is up to you to respect the users settings about downloading large files without wifi.