My brain manages to do the correct thing for about the first 15 seconds and then goes stupid ;) Nice work.

This is a classic challenging thing that doesn't sound challenging. The execution is also great! It looks nice and the subtle changing background gradient manages to look good while not being distracting.

this is a good game, got to 18 points on one of my first 3 playthroughs and after I couldn't get more than 13... I think it would be good to put a button to start/restart though instead of taping the boxes, because I accidentally restarted the game some times before getting it to stop and see my score.

This one is frustrating in a good way lol, great job!

Reminds me of the old NDS Brain training! I got 21 points.

This was in my brainstorm ideas aswell :) 
Maybe you can also make it extra diffcult with words like "banana" to tap a yellow box for example. Looking good so far! Keep it up!