Confirmed systems, missing values
The official game description confirms that points from shelf work unlock upgrades. The public Roblox badge list also includes a no-abilities completion challenge, which confirms that ability use is a real gameplay consideration.
What is still missing: upgrade names, prices, level curves, ability names, cooldowns, effects, and a developer-published best-upgrade order. Those gaps are why the current tier list ranks cleanup priorities rather than pretending to know a complete upgrade meta.