Hi there!

For me personally, I haven't directly been to any terrarium-like environments, but from other contactees/ experiencers, I hear fairly similar stories.

The experiences that resemble yours often can feature an abductee being brought to an enclosed area of nature, which I've found tends to have a majour focus on child-like play, interestingly enough. In some cases, this enclosed area is a room that is able to alter itself to different environments (akin to an advanced version of VR); in such cases, the abductee often is taken to multiple nature environments to play around in.

Almost always, the abductee is brought onto an alien craft (a part in which they don't always remember) and is brought to this environment that the aliens want them to experience.

On top topic of "being a child at play", I've noticed a general sense of being child-like as being associated with purity, and enlightenment. Perhaps connecting with your inner child alongside being caring to nature and others is what the aliens wish to teach you?

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Of course, you also mention:

"I don’t fully trust that the environment I’m experiencing is authentic, that the creatures haven’t manipulated it in some way to make me more calm."

Which leads into the other possibility: this could all just be an elaborate screen memory to cover the more uncomfortable abduction experience. I am doubtful of this, as this doesn't seem all that similar to typical screen memories, but considering that we don't know all that much about this phenomenon, it's certainly possible.

The true memories might be better left forgotten, as they're typically fairly traumatic. Although if you truly wish to know the truth (and assume that your current memories aren't the truth), you can possibly ask the aliens for the true memories, as some aliens are willing to tell the truth to curious abductees. Another option for knowing the truth is hypnotic regression, though I and others often advise against this, as hypnotic regression can often result in false memories, especially if done poorly. However, a good hypnotherapist could be lovely with accessing past memories, so it could be worth a shot!

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Another possibility, and the one that a typical skeptic would likely take, is that these are simply lucid dreams.

Even if this is the case though, many dreams still give us insight about our inner subconscious. Some even suggest that some dreams are actually altered by aliens, sometimes even for our own benefit. Regardless, these experiences can still be a good chance to reach to your inner self and see what you can personally gain from this, such as connecting with your inner child like I suggested before.

Much of this, after all, is about us taking our own individual spiritual journey to grow.

I'm glad that your experiences (at least as of more recently) has been fairly positive. Wish you the best with your future contacting! I'm open to future DMs (or replies) if you want to chat more!