If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Stream is based on flow manipulation, You can forward, rewind, play or pause the action. While those core controls shift platforms around you, it allows to move accross each level of Stream. The more the player advances through the game, the darker and harder it becomes.
BONUS: Try to finsish the game faster than us !
WSAD to move.
A to rewind.
E to forward.
Left click to pause and play.
To switch to ZQSD (azerty) keyboard, press Alt+Shift.