I really like the idea but the way it is presented is a bit messy. I didn't understand the letters I obtained were "saved" in case I was touching red objects. Maybe a little information to show which letter is actually "used" to move. Maybe put more random on the touch attribution (like if no "E" already assigned, put it to a random direction).
Also, the theme is taken easy here. Simple but clear. Good job !
Great idea for a little scoring game !