This game is a fun one, the atmosphere is really good, so are the graphics, the game play is also good, but I have some ideas to improve it [this is if you make a post jam version]

1. Make the controls on the mouse,  the keyboard controls are weird for a game like this, imo it would be better if you pressed where you wanted to go with the mouse.
2. The offset is a little bit weird, I would make it so that it's focused on the player, instead of offsetting it to the left.
3. make the shadows stay even after you jump, there is a setting in unity for this, but I forgot which one it is.

But those are all minor nit picks, and considering that this is your first 3D game, you did amazing :D

Atmosphere, I would say is good.  I count all the little houses, sheep, and lizards even a guitar player!  That is a + for the atmosphere category for me.

Graphics were nice.  It feels like you had a good style.  The pure yellow background could of used something a bit more to feel more like a desert, but that is nitpicking.

Credits menu is a bonus.  Could of used a controls and instructions page in game too.

There was a nice story in the description, which also fits the theme, but then it was not really conveyed in the game.  I mean, I should not need to read your web page to see that story.  For example you could of made a second menu like you had for credits, which could contain the story you put on the web page in the game.

No sounds, No Music.

weird but funny.