Ok, game review: First off, I hope you can fix the alt-tab crash bug :( If you're still working on this, that is. The game has crashed four times on me, always when I switch to a different tab and one time because I scrolled down in the page. I only got 10-15 mins into the game each time, I didn't manage to unlock anything in the store.
I don't know if it helps, but I get the following in the browser console when it crashes: TypeError: AudioListener.setPosition: Argument 3 is not a finite floating-point value.
Other than that, it's really fun! Very fun concept and engaging game loop. I did get stuck on the fishing mechanic, I didn't realize I was supposed to do that. On my first playthrough, I got to the chest on the left and got the fish, and I assumed the fishing spots would give me the same fish so I didn't think to try them out.
Also, it's possible to get stuck out of certain spots, for example on my second playthough I tried to get to the chest on top of the blob creature, but I placed a column to its left before I knew it had to be surrounded. That may be intended, though, as it's fairly quick to restart the game!
I do think it's really relaxing and a fun idea. I'd play it to the end if it didn't crash! With word games like this, I usually leave them open in the background and play them little by little over a few hours as a little break, and this didn't quite work here.
Looking forward to seeing what you make in the future!