Pretty solid game. Very though to master it and understand how you should play. The music doesnt loop very well and, if i didnt last for more than a minute i wouldnt listen to the rest of the music, on these genre of games the music shouldnt restart so the player can listen to the rest of the song. 

The use of the prompt of Expedition i think you used it as a narrative choice so i will take it as well used. I cant for visualize very well when you can use again the boost bar, so it needs a feedback that attracts more attention, like a grow animation or something like that. 

For the sound,  i liked the music and i manage to listen all of it, i thought it will loop fine but it didnt, just a finish and start song.

For the balls, i noticed that even when a ball is out of sight, it can kill you and make you lose. That makes the game unfair i think. Overall, a solid arcade game that with more iterations will be a very great game.