This is really well made. The visual style is super appealing and cohesive, and the gameplay itself is quite fun. There are a lot of nice details to make playing this game more accessible—the numbers telling you what'll happen when you place each tile were especially appreciated, as were the tips for each tile. Some sort of explanation for the basic mechanics (e.g., how height works and how crowding decreases your score) would have been nice, but I was able to figure them out decently quickly.
There are a couple of extra things I would've liked to see. First, I wish there were some sort of indication when a tile was on water and couldn't be placed. Typically, games of this sort do this by highlighting or coloring the invalid tile red. There were a few times I'd place a tile in what I thought was a good configuration only to be denied because one of them was on water.
Second, more camera controls would be nice! The current perspective never causes any problems, but I'd love to see my city from different angles.
Third, I would've liked a mode with fewer tiles. I see from the comments that a lot of people are playing up to 100, but for me it gets quite repetitive after about 30 or 40. At a point I'm just hovering tiles over my crowded island to see what gets me a positive outcome. I saw a previous comment suggesting a level-based mode, and that sort of thing would be perfect for me.
Lastly, there isn't really that much of a spin theme going on. Sure, you rotate the tiles, but you do that in every game of this sort. This isn't something I'd suggest trying to shoehorn in though. Even despite the distance from the theme, this game is great on its own merits.
Great game, and thanks for sharing on Discord! I hope this comment is long enough :)