Pretty difficult, but still good. I'm going to include the solution to the semaphore puzzle as the other comments didn't explain it and it was really difficult to figure out.

****SPOILERS FOR PUZZLE****

You need to direct the light to each direction individually by clicking on the circular light symbol on the light activation thing. It spins when you turn it on, but if you turn it off, you can manually redirect the light. Each time you do, go back up to the observation deck and look out the window with the light, and take note of the position of the guy in the boat. Do this for each window/symbol, using the chart to convert the flag positions into the numbers.

You have a good game here. Good atmosphere and tone. The puzzle are interesting, and the solutions are fairly intuitive. However, the semaphore puzzle is one of the least intuitive puzzles that I've ever seen an escape type game. It took a bunch of attempts, but I was able to understand it eventually and complete the game.

Despite my praise for the gameplay, the promises of the game description/intro are never explored in the slightest. The game does heavily imply certain things have occurred, but there's nothing at the end that connects to the intro. I get that this was made in 14 days, but you can't make promises in the intro and then not deliver. If you're going to expand on this, keep with the noir style, but remember to give the player more of an anchor than just the puzzles.

The game is quite fun, I got stuck at some puzzles. https://lego2kdrive.io/

Didn't need any help for the stairs, discs or storage puzzles, but do for the semaphore.
There's only one position shown by the figure on the boat, and no logical number combo works on the four digit puzzle. How about a clue?

EDIT: Thanks, tried combos of the symbols and their NSEW positions on the windows... no dice.
BTW, kinda like the Rusty Lake vibe.