The Long Walk Home
You need to explode prisms in order to send projectiles up the long path and eliminate the approaching Frogfish. And you need to move quickly!
Start by moving the closest prisms down along yellow arrows. Then move prisms (one by one) along red arrows into the current. Finally, move the remaining prisms into position.
Make sure you only explode one prism at a time, otherwise a chain reaction might destroy (and waste) several much needed prisms.