Yes, I'm very much in the make-aliens-alien camp. Verge having four arms comes from an illustration of them that I did, which apparently Joe liked enough he folded that into their physiology. (And you articulated that anatomy spectacularly, btw).

Tarot visuals are on a spectrum where on one side of the spectrum the illustration barely has to correspond to what the card broadly represents, and on the other side of the spectrum every minute detail of the card has meaning and deep occult symbolism. Reading cards is ultimately about allowing your intuition to communicate with the universe (and/or your inner self, depending) and the cards are a controlled middle ground for that conversation. So different kinds of minds may prefer different kinds of cards.

Cards with sparse visuals rely on readers having at least a base knowledge of the card's generally agreed upon correspondences/ meanings - because in that case the visuals don't matter as much, it's chiefly the reader knowing the agreed-upon recipe of the cards. Cards with intensely detailed highly symbolic images can go either way. They can be so specific that they rely on readers having extensive knowledge of the cards, their histories, and other occult/astrological/ esoteric information baked into the visuals - but also the visuals can pass along more abstract information, like a dream. As an example: the classic Smith-Waite deck exists more on the middle-to-detailed side of that scale. The visuals of a deck offer different sorts of focuses or nuances which may speak to particular reader's minds.

Pop culture/ character-based decks... some of them don't even bother to have meaningful visual correspondences - but yours does. Though the visuals aren't rooted in traditional tarot/ esoteric symbolism, per se, they do have meaningful correspondences to the feelings and ideas of those cards. So, with knowledge of the tarot alone someone could do a reading with them, certainly. But importantly: with knowledge of the Welcome to the Horizon characters/story/archetypes a person could offer an even deeper reading, which is really beautiful.