I'd say no more than 30% of the game should be premade. Use an art pack seems totally fine!
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Great work! I also saw your post in pico-8 server. If you are looking for collab, discord is a great place to go. Though I found pico-8 guys tend to do jams alone, collab should also be encouraged! It's better that you have an idea for yourself so it's easier to find a team that fits. Good luck!
And here are the cost for each action:
- breath regenerates 5 oxygen
- eat consumes 1 supply for 15 energies
- rest consumes 5 energy for 20 oxygen
Also they are influenced by altitude and random events.
Thank you! The original music is made by a metal band: https://www.youtube.com/watch?v=fnD8OHsllm4 They won a prize on wacken open air 2017.