The beggining should be annoying when u make the leap of faith, so to those of u need help, here's a hint. Notice how when u fall you see his entire body, and how both sides look the same in a way...
Haha, its like a tiny Mario game: Same pixely look, you get about 2 lives if u control a human, you can never kill the enemy unless u have some enhancement.
Too bad when i set the mission "Destroy Earth", there would be a cool cutscene where all of Earth was like "We must send all of our troops to destroy them before it is too late". And then there would be like a 5 minute timer.