Love this game because I used to do a lot of monkeytype, keyhero, and keybr, I'm learning Colemak right now so it's perfect! The mechanics to add time to the timer with those mini-games is brilliant, even if they do feel annoying (mildly is putting it... mildly), they feel like popup ads.
I got really confused with the match the shape minigame at first because I'd thought that you had to drag the lighter/grey colored shapes to the black (what I thought at first) holes. Also, the build tower game I couldn't get right, which was frustrating.
Other than that, I love the keyboard typing SFX, it's so crisp. And the music is kind of a love-hate for me. I love it for the game, but I hate how I feel rushed, especially when the cymbal? open hat? hi hats? play as the time runs out. I don't know if that was intentional or not, but it sure as hell lit a fire under me and got me to type faster.