Nice music and cute theme!
The first level had the world light up around you... then it was just fumbling blindly in the dark!
I accidentally used all my shocks on level 1 and had no way to charge the star on level 2. Level 4 is impossible since you are out of charge? This also makes shocking the fish pointless and actively harmful.
It wasn't immediately clear it was tank controls, perhaps allow the player to rotate in place?
The exit portal still made sound but did not let me win if I touched it in the dark.