Camera
w - up
a - left
s - down
d - right
Player
up arrow - jump
left arrow - left
down arrow - teleport down
right arrow - right
Double jumping (up-key twice) quickly makes you jump higher than spacing them out;
Also, using your bounce momentum + jumping will get you higher
Pressing down while on the ground will center your character
If you aren't getting ~60fps (top left corner), try closing a few tabs :)