Good game,bad game

The characters are GREAT,I especially love the dbz ones,the game and its setup are great,I really want to saythe game to be perfect,but,its not,there seems to be a problem,idk if its just my phone or what,bc I have an iPhone 4(maybe S),but after a while of doing the challenges and watching videos,when u click on the button to do it,it doesnt work,it just clicks the button,and doesnt do anything,even the play again symbol is invisible sometimes,plz fix that,if it were not for those...glitches I guess,this game would be 5 star perfect

Skinnymidgit03 about Crossy Creeper: Pixel Heroes in Mine Island!, v2.1.3