its not that you can only use it once, the hitbox is small so you cant reach it from down, you need to get up the ramp then walk right and immediately click E, but yeah on second thought that may not have been the greatest design choice
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I feel stupid for having to get a hint now. In fairness the portal wouldn't work from right to left a second time, which I think should be allowed, IMHO, so people don't despair like I did.
Completed it and it loops back to the beginning. Nicely done puzzle game. I appreciate how you used multiple player characters to fulfil the wildcard. They all tiny.