I went through at least 10 levels before I stopped, this game is amazingly complete! It took me a long time to understand the E mechanics properly, and near the end I just gave up and always picked up in the EVOL order for both characters, but this is really a nice puzzle game. Congrats!

The puzzle in this game is surprisingly hard. I love it XD
I beat all of the levels and enjoyed every levels XD
Sadly, the tutorial is hard to understand. Maybe you can add number in the white circle, so the player can understand better what shift and reverse do. I got stuck long in the early levels because of that. You can also add "drop letter" in the tutorial. I got surprised the first time it happened to me.
The level design on the early levels are also good. It forces you to take/drop some letters and then using shift/reverse to rearrange the letters.
Sadly, the later levels didn't require that because the player can just dodge any unnecessary letters or just reset every time it happened.

The concept is neat but the game itself is too confusing and unclear even with the tutorial :( I have no idea how to predict where the letter i'm picking up will go.

Hey, from the screen shot the games look really fun! I attempted to play it unfortunately even the first level was too challenging for me. I gave it 3 tries and I think I am just too dumb for your game :D.