Interesting concept!! I somehow got a negative score, and completed the game by fusing together two tier 0 monsters?? I don't think the mechanics are super clear, and i wish i could have seen what the monster I ended up getting that let me won was XD I might go another round and fuse the monsters at a lower level than 10, I'm guessing that's why I jumped so far...
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I ended up "winning" by breeding a tier 0 with a tier 1... and apparently that made a tier 5 and there was me trying to fill out the monster lexicon and being reset... don't think I'll try to actually fill it out if at any moment you could loose it all because you tripped up on a tier 5 combination!