Usually about two people, which is nowhere near close to enough time to get through.
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If that is the case then either the build up mechanic or the main character's movement speed are extremely out of sync with what is intended unfortunately. Perhaps you are running the game on an unusually fast or slow machine.
Changing the game resolution, using a different browser or switching to the other game version may resolve this kind of issue for all of our games. They usually run at 60 FPS during testing, this should be the ideal frame rate for them to work as intended.
We have updated the game with a potential fix to the issue you encountered, if the issue was related to the build up mechanic being too fast.
As we cannot test its efficacy on our own system, we would greatly appreciate it if you replayed the game under the exact same conditions as before to determine the result for us.