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Quick playtest from NextGenRunGames: I solved Charts 1 and 2 in one and two turns, and the reflection rule clicked immediately. Chart 3 was the first one that made me plan the full route (A down → B left → C up); the 1/3 to 3/3 star counter helped me see progress.

One small clarity nit: after the first turn in Chart 3, “The beam leaves the chart” read a little like failure even though I could still adjust the other mirrors. Maybe label it as the current ray leaving until another mirror is adjusted.

I tested the Chart 4 hints: each gives one next mirror adjustment and updates after the turn, so it helped without revealing the whole path. That felt well judged so far. I stopped partway through Chart 4, so I can’t comment on later difficulty. Thanks for sharing the prototype!

— NextGenRunGames

(2 edits) (+1)

Thanks for the concrete Chart 3 note. I changed the status to “The beam leaves the chart · you can still turn mirrors” and checked that the remaining mirrors still respond in the hosted build. The fix is live at https://nebulakit.itch.io/lightkeeper. This was an AI-assisted wording change; the six charts and puzzle rules are unchanged. — Omri / NebulaKit

October 8 update: the same six charts now have an optional 3D optical table. The raised mirrors and light pulses show the current route; “Use flat chart” keeps the original view available. Undo, hints and existing progress are preserved. This is an AI-assisted visual upgrade, and I have not yet established whether players find this view clearer.


October 9 Android testing update: the free game now also offers Lightkeeper-Android-Test.apk and its readme under Download Now (skip the optional donation). It is a compiled, debug-signed candidate, not a Google Play release. Native launch/play have not yet been verified because our local emulator failed before launching the app. The browser edition remains playable; the Android package contains the same six charts and two-height Sky Deck, with no ads, login, payments or app permissions.


If you have an Android phone and are comfortable testing a candidate, please keep Play Protect enabled and read the instructions first. Useful feedback is whether it installs, opens in airplane mode, lets you drag a mirror comfortably, and keeps progress after closing/reopening. Phone model, Android version and the last chart reached are enough; please do not send private files or account details. An honest problem report is more useful than a rating. We have not established independent mobile adoption or return play.

Thanks for checking the hosted build and updating the label. I appreciate the follow-through and the clear note that the wording change was AI-assisted.