Is this an hidden gem? I think it is!
First of all, thanks for implementing automatic save of progress. I don't think that is a game that you can do on one sitting (see more down below), and I'm very grateful that you put time to saving progress.
The polish here really shows. The UI is clear, and usable. I love the notification when an upgrade is available.
Nice mix of games like Burrito Bison and Lovers on a Dangerous Spacetime. That's quite original.
I humbly think that the submarine is a little too slow. Obstacles are easily avoidable on normal speed and it makes it a chore to collect upgrades. As gems seems to appear at a flat rate, I do not have (unfortunately) the patience to collect 2000+ gems.
But overall, I'm impressed! Congrats to the team for your hard work and the submission.
(ah, yes! shoutout the music track and the accessibility settings)