Thank you, for your in-depth review of the project. Some very good points.
I realized that it is running at very different speeds across different hardware, some extremely slow other extremely fast, and on my computer, at normal speed. So calibrating the speed to be the same everywhere is a head scratcher.
Dying floating out of the top screen, is properly the downside of making it upside down, gravity normally kills - negative gravity not so much - but making a closed top and then opening it when all pick-ups are collected, may defeat the abyss ascent feeling.
Another head scratcher is the minimal traction it is gaining, and I'm not sure, I'll be able to convince myself, that it is worth investing additional time into a game no-one is playing (I did post on Reddit and SoMe - which is where most of the traffic is from, but it's been zero for a week now).
(Btw. I did work as a professional game dev for a year (3d game engine stuff), and I also code: https://github.com/tin2tin?tab=repositories but this game was mainly vibe-coding test, to see how far I could get that way)