Just tried the game out and it was really cute! If I had a kid I feel like this would be a really fun way to get them to practice typing. As for the downsides it is pretty easy, especially since I'm a programmer so I type a lot. I wouldn't say to straight up increase the difficulty but adding some difficulty options might be nice for as the player gets better at typing. The game also crashed around the 30-40th floor I believe. I was playing through the browser so it may have to do with that.
Overall though, really cute and fun game! Just needs some fixes and maybe some difficulty options and it can shine!