try spamming backspace and delete button. this is a game problem where the answer has to be exactly the word, and nothing else, not even a spacing or an extra empty line.
i think most people face this problem. On question 3 onwards, clicking in the answer box allows you to type. However, it lets you type on the second line. You need to input your answer on the first line. Pressing backspace helps.
and, this game have hell lot of bugs.. sometimes i type the answer it works, sometimes it doesn't..
maybe you know like after you completed one ending, you can like restart from the point where you got all your upgrades, to try to obtain the second ending. Playing from the start again is kinda irritating :( 4/5 tho
 "Starcom"){kind=icon}
 "Dead Drunk 1.2"){kind=icon}
 "Forever Winning 2"){kind=icon}
 "Shopping Street"){kind=icon}
 "Super Karoshi"){kind=icon}
 "Fishing Girl"){kind=icon}
 "Endless Zombie Rampage 2"){kind=icon}
 "Crush the Castle"){kind=icon}
 "Reincarnation: Riley's Out Again"){kind=icon}
 "Robot Dinosaurs That Shoot Beams When They Roar"){kind=icon}
 "Portal Defenders"){kind=icon}