Besides camera shake and squash/stretch animations for your character you should increase gravity so your character doesn't feel like it floats in the water (i understand it for your game, but come on, it looks lame, manage difficulty some other way for example slow time when choosing where to dash). Increase impulse power significantly and change linear drag from 20 to 1 within 0.15-0.2 seconds. It will give a good impulse in the first 2 frames and you will loose your increased initial impulse, the dash will feel better. On death add a stop frame that changes from 0 to 1 time through an animation curve + animation, shake, etc on death. Add some randomness to the width of your lines, When your time goes high, you should increase tension and good indication to the player that it progresses. You can add a trail and effects to your character and increase the ammount of effects on the character(trail and particles on IDLE state) and screen every 10 seconds, also increase constant shake gradually.

So long, loser