Wow, an incredible amount of polish for such a short game jam. Easily lost about 20 minutes playing this, I ended up in a situation where the penguins were starting to take over so I couldn't make much progress beyond that but with a bit of tweaking I think this could be really neat. Nice job.
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This game jam we really worked hard, using the time to the very end of the submission deadline. Doing all the animations, implementing features, and doing right balance was time consuming, but I think it was worth. I'm personally proud of the outcome.
Penguins are being more nuisance with time. The better you get at optimizing production and upgrading, the less of a problem they should pose :D