Nuxus — no link in the post, so I tracked the game down (sixfold-castle) and gave it a cold run: real input, headless, WebGL through software rendering.
Two things that don't bite:
1. When WebGL can't start you get "The castle could not load. Reload the page to retry." But your own code already knows the real cause somewhere else: "Check WebGL 2 support and reload." Any browser that only offers WebGL 1 (older/cheap phones) lands on a dead page with no clue why. Put the WebGL 2 line in the main failure, and name the requirement up front.
2. Your first tutorial beat does four things in one breath: "Tap a building to inspect it. Tap the Castle or Barracks to train. Tap a squad, then ground to move. Drag to turn the world." I read it three times and still didn't know the first move. You already have a per-step tutorial system — highlight one target per step.
The rest is solid: clean boot, zero page errors (only a favicon 404), the six-faced world reads, and a seasonal 12-wave campaign is a real take on "Castles".
Swap if you like: I made Hollow Castle — oneslicemissing.itch.io/hollow-castle. One tap picks which home you dismantle; its stone becomes your next floor. Play it and give me one line: where did the water catch you?
