I've downloaded "Noisy Typer" to make typing fun.
Noisy Typer – a typewriter for your laptop. | F.A.T.
I found it quite enjoyable to type with this app, but it's only when writing in English.
You don't have to press Enter key so much in English, but in Japanese, you have to press it tons of times.
The problem is that every time you press the Enter key, the app makes a high-pitched bell sound,
which surely makes it a real "Noisy Typer".