The instructions are in the game!
Click on the orange question button in order to view them!
If you want, you can also look here as well!
A and D Keys/Left and Right Arrow Keys/Left and Right Buttons to Move
W Key/Up Arrow Key/Up Button to Jump (You can Double Jump)
*WHILE RUNNING+HOLD* S Key/Down Arrow Key/Down Button to Sprint
*WHILE MIDAIR* S Key/Down Arrow Key/Down Button to use Jetpack
Have fun :)