What is the crowd's opinion of ZType Space Typing & Spelling?

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Link for the lazy

https://zty.pe/

https://play.google.com/store/apps/details?id=org.phoboslab.ztype

Recently started playing Ztype. It's good for increasing typing skills and vocabulary. Fun!

Oh, you can also play it on Android and iPhone

If you're ok with a space invaders type of game ztype is great:

https://play.google.com/store/apps/details?id=org.phoboslab.ztype&hl=en

Ever since it released on Android, Ztype.