That was a wild ride! Skimming the other comments, I totally agree with not adding teleport so close to the end. As is I think 3 level would have been pretty good, the 4th level took so long I almost gave up thinking there was a bug. I loved the final form, it was huge relief being so powerful after struggling for 15 or 16 levels.
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Yep 15 full days and nights on normal. I kinda just skimmed the instructions initially so the first 3ish days were mostly building fire instead of distributing them more equally so that definitely slowed me down and I think I just got unlucky a few times when I built out the other elements. Re-reading my post, I must have been too wrapped up thinking about the design but yes, the first 10 days were definitely fun so I think your target of 8 was perfect (and it wasn't that it was un-fun after that, just definitely increasingly tedious, esp as I started to wonder if there was bug).
Having some more time to think, what I really like is how it's kind of a series of micro puzzles. Balancing complexity is always hard but I think this was a super cool way to address it. Generally there was clear winner for large traversal but then actually taking out enemies was only thinking a few moves ahead, instead of dozens. Another addendum, while it would have been nice to pan around, having the minimap was great, it really gave a sense of strategy.