You are data, piloting a payload of pixels that comprise valuable images in someone's Tumblr account.
You're travelling through a fibreoptic cable, so your deadly laser beams will reflect off the sides of the cable, possibly hitting you in the process. So it goes.
On route, you will encounter tireless enemies, they're probably electrons or something, and they'll follow you, attracted by the positivity of the data you carry.
Destroy them or avoid them, your
task is the reach the end of the cable, and the destination computer screen, before the wait becomes too long, and someone decides to go outside to play instead.