(Note: you don't need to read all of this, just the movement controls, because the rest is pretty self-explanatory)
Left and right arrows to move (tap where you want to move on touchscreen),
space, up arrow, or tap to jump.
Press the restart icon or R to restart the level.
Go through the portal to get to the next level.
The number in the portal is the number of clones of you (jump into a ? block)
that need to go into the portal to get to the next level, NOT the level number.
The yellow keys can also unlock the yellow locked blocks,
which will make you able to jump on them.
The red blocks and keys work the opposite way. Keys can also be obtained by killing Toombas (the red/white enemies).
The clock enemies explode when their hands reach the same point,
and can kill you and explode specific blocks when they explode.
Lastly, if you or any enemy falls into the lava, they will die (eventually). Have fun!