Really cool, except the price. Around 500 Euro for the full thing... I miss the times you could make amazing things with a Pi under 100 Euro.
If you have a Kobo (~ US$ 120 or even less used) you can run this using Cobalt https://github.com/BandarLabs/Cobalt/tree/beta/apps/birds
That's the e-ink monopoly for you. Though you could probably use a slightly smaller b&w eink display with a second hand raspberry 4 to shave a lot from that number.