a nice little typing game, I managed to almost get to 200 - I was somewhere around 190-195. Seems to work really well, assuming you don't press enter as people below also said! If you want to stop that, you can subscribe to the "On End Edit" event on the text input field, and do EventSystem.current.SetSelectedGameObject(gameObject); and it'll re-select it for you immediately.
Otherwise it's a pretty nice little game, though I think it would greatly benefit from a bit of post processing (bloom is your friend, it will make that lava look awesome) 😁