Well, it's not for everyone and that's for sure! But thanks for giving it a look in any case.
Curiously enough, the pale yellow with black was chosen (with a bit of research) as the most readable text theme (as opposed to black on white or Adventuron's default white on black theme). I did have a plan to provide a choice of themes - a bit of a faff to do in Adventuron, but possible - but ran out of time with that one. I may put it in at some point if I get the time and impetus to do it.
Many thanks for the typo spotting. The book disambiguation thing is something I'm aware of but isn't very satisfactorily resolvable within the limitations of the engine so imperfect though it may be, it is what it is for the moment.
The window? Well, the window is up high and out of sight and the recess is there and described, and there is a hint that tells you what to do... I thought that was one of the fairest puzzles! But I appreciate you didn't find it so. Could the game be completed without the hints (or the explicit STUCK instructions)? Probably not, except for very determined players. Does that matter terribly? Not really, to me.
Anyway, thanks again for the feedback. I will attend to what needs attending to, particularly missing scenery and suchlike.