Hey there!
I see the game's files are hosted on Amazon S3 right now. May I suggest using https://itch.io/docs/butler instead?
- You can automate releases with it (which I assume is what you're doing with S3)
- Pushing small updates is faster (because it only uploads what changed) — it's also faster for https://itch.io/app users, because they only download a small patch
- Files will be served via itch.io's CDN, which is much faster than a storage service such as S3
Additionally I recommend shipping a .zip file for the macOS build instead of a .dmg file — this will allow incremental upgrades for https://itch.io/app users.
Let me know if you have any questions!