Shut Up And Run

You wake up inside your cell as a test subject in a secret lab. After finding your way out, you come across one of the many experiments. "Experiment 335B" aka the "Rift Flag". You gently touch it and it transports you to a different dimension. At the end you see another rift flag that will take you to another dimension that also has a rift flag that takes you to another dimension... You get the point. Your only way back home is to defeat the one that has control over all the rift flags, but can ...