Use your cursor keys or go into options and setup your own controls.
Or you can use the onscreen joystick and just use your cursor up key for jumping.
I originally wrote this game for Android and this is the first Flash export.
In this flash demo you can't die and if you fall off a platform you will be saved. Also all the levels are already unlocked for exploring.
Current issues with Flash export (hopefully solved in future release):
Controls are a little laggy.
Music loops are not seamless.
Right mouse clicking in the game will hang.