Thank you so much for your constructive feedback!! I agree that sometimes the options may be a bit overwhelming (and believe me I tried to simplify a lot of the puzzles alr after feedback) and I’m still trying to consider what is the best way to present the answer to the player in a still challenging format. Regarding the sound effects, I actually had some ideas of sound effects in my head but I don’t know where to find them haha. Thank you for your feedback and I will take them to heart in my future projects!!
Haha I get the sounds part. I always leave it as one of the last parts to do in my games too, but it's such a crucial thing for game feel and polish. It's an underrated part of game dev that's not noticed until it's missing.
For free sounds, you can try checking out freesound.org, opengameart.org, or soniss.com. The catch is that it might be unorganized and you have to wade through a lot of it yourself to try and find a good sound for each part of the game.
If you have the means, then you can try checking out ovanisound.com, which I used in my own entry. Might seem expensive on their website, but I have only bought stuffs there when they go on sale from HumbleBundle or on their website, which is usually like $20 for a lot of packs. So it's good enough of a value proposition for me to pay.
Hope it helps!