Nice work on this one! I liked the movement of the sub (I'd played a different sub game in the jam that felt harder to move). The concept and the art was nice - very well executed in a week going solo! Back to the movement - I thought the rotation was well thought through and felt like I was directing it when its nose pointed the right way. The boost feels good, and is definitely better to run away from enemies than try to face them with the light.
I did find a couple bugs. You might check your hitbox on the sub and consider smoothing/rounding it a bit. I got caught on one of the skinny ledges and couldn't get out. When I mouse over the Restart button parts of it get cut off and it says "Resta". And one suggestion - it would be cool to see my final score on the gameover screen.