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Unfortunately, I didn’t figure out how to activate the teleport, but I honestly cleared all the rooms of monsters (I admit, my brain was a little broken trying to understand the level design).

It was disappointing that I found 20 shotgun shells, but did not find the shotgun itself. But it was fun. The style has a Duke Nukem 3D atmosphere.

Glad you liked it.
To activate the portal you have to keep standing on it (rotating red particles show the progress)
Finding weapons is indeed a bit rare (too rare in hindsight). They spawn in at most 1 room (not guaranteed as the level are randomly generated).
In later stages the chance to find the room increases (due to more rooms being generated).