I'm not really sure if anyone else has this problem, but it's big enough for me to make this.
The minigames on mobile are nothing short of awful. The weightlifting and the running minigames both suffer from this weird input lag that makes it pretty much impossible to win and the tennis one goes from easy to why-bother-trying as soon as you get a single point.
The tapping both sides method works in concept but as soon as you actually try it out you can get halfway through before your thumbs start to ache and it doesn't even register when/if you're tapping or not.
The rest of the game is nothing short of fantastic.