As a connoisseur of Euro Truck Simulator and similarly chilled-out games, I really liked this.
Feedback:
1. I enjoyed playing through this. I liked the simple control scheme, the fact that the aim here was just to float from rooftop to rooftop and enjoy the view. It was nice. And that's not me just searching for compliments, I mean it!
2. I feel like you should lean into the Hot Air Balloon immersion here, adding some sound for increasing the height of the balloon, adding wind sounds when your moving between rooftops.
3. Some mechanics could just be cut here in favor of more hot air ballooning. Like crouching and jumping, I don't feel like they added anything to the game. Also, why force the player to jump into the balloon at the start? Why not just start them off in the balloon?
4. There are some slightly hidden features here that I thought were nice, like zooming in the camera with the scroll wheel to see things that are far off in the distance. . Lean into the idea that you are in a hot air balloon and add things that you think would be fun in that context, like chucking stuff into the water, or leaning over the side of the basket and looking down. It's fine to have a game where you can just enjoy the view, the fun part of making games like this comes in giving the player some toys to play with along the way.
5. Consider adding an option for a 3rd person perspective. It would be cool to see the balloon as it flies through the air.
6. Wind animations. It would feel really cool to be able to tell how fast you're going from looking at the speed of the wind blowing past you. (or from what it sounds like).
7. There were a few bugs, but nothing really major.
8. This was a nice relaxing game to play. Well done