"Inventery" is intentional: like "sneakery," it's a made-up word so that a character's invention skill would end in an "ery" like all the others. So glad to hear you enjoyed it!
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Then I feel entirely justified for awarding you the highest mark! I should have picked up on that (especially with sneakery being in there, though in my defence a lot of these get written rather late at night).
I tried a run through with some of my ESL students last night. The role playing only really comes out between missions, which is weird: if you do decide to have another go at it, it would be great if you worked more player agency into the missions. They loved the simple character builds and stocking up on supplies at space stations, so thanks for providing forty minutes of entertainment to my class!