Great execution on the art and sound, which really makes the game. The upgrade system was a nice touch too. 

My suggestion would be not to frontload the player with that much text. For me, the "double click" got lost in the all the text. I was too excited to play your game after seeing the background art and I ended up skipping a lot of the text, as some players might. 

It might be better to just add a button prompt on screen with a few words, and if you want to have a text explanation in a speech bubble, use fewer lines.