Thank you for the thoughtful feedback. I'm really glad you had fun. You are correct about the secret doors. I'm really glad you like the art style, the main engineering effort in preparation was setting up an engine that was so similar to the game engines of the early 1990s in how it renders things. Turns out drawing every single angle of every single wall by hand was a gargantuan amount of work! But worth it I think.
Fun fact you can get a lot more than £275 if you want the game to get, well, brutally difficult! ;)