Consider making full keyboard controls (ie something for zoom and mark)? Could do Z and X for zooming, hold down space or shift for marking. The zoom feature feels really hard to control on a laptop.
Excellent art, fun puzzles once you realize you're not going to get any instructions and just need to figure it out.
Rather than clicking the lightbulb, it would be nice if the cursor glowed or changed color or something to indicate we're hovering over something we can interact with. Also, an option for increasing text speed would be really nice.
This is probably a really dumb feature request, but it'd be cool if we could romance the npcs, or if our conversation choices affected how they react to us.
Currently there is not key for marking tiles, but there are keys to zoom! the + (technically =) and - keys.