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You are My bug #1: Earthworm.

I've tried to evoke the feeling of an earthworm living underground and going to the surface.

I've set some rules I think that are in all the Valve Portal Puzzles, and I've been faithful to them, no need to restart, no option to get stuck, no bizarre solutions... just take your time to think and look around, these are not difficult tests.
While testing I noticed two bugs, I expect them not to appear.
I'll try to make more chambers the following weeks.
Please comment, and thank you for playing.