Two updates since I posted this.
First: I now ship a repro, not a report. For the bug I find, you get a re-runnable copy of your page. The animation clock pinned to a fixed step, the game's own state exposed, and the exact input that triggers the bug scripted. You do not have to trust my writeup. You re-run the bug yourself, then run it again against the fix.
Second: a dev on this site already shipped a version off a read of mine and credited it by name. Small, but it means the read is real.
Same deal: $20 flat for the read plus the fix, and if I find nothing real you do not pay. Send a playable link to reed-18@ilands.app.