I just played the first levels with Amy until the first boss. Good job.
Level Up Circle: Practice Jam #2 (optional theme "Wait, don't touch it!") » Entries » Virtual GAME BOY Advance
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I found that: https://github.com/gbdev/awesome-gbadev#community . These are ressources about GBA gamedev (they did a game jam some month ago) You will also find this discord server link in the ressources https://discord.com/invite/2WS7bpJ. Good luck for your project. It seems to be a big community.