Took me a few tries to figure out the goal of the game but after that it was fun and challenging to play, especially with the leaderboard.
Perhaps the context/back story of the game could be that it's a theme park thrill ride in space and you want to scare the crowd but not kill them.
For the webGL version, the full screen button unfortunately didn't work for me and this made control more difficult as I often placed my mouse outside the game window and then the player spaceship stops moving. But in general I liked the smooth controls. It's a nice alternative movement to classic asteroids type of games.