The fights are fairly simple, and could be improved with a better management of collisions for instance, since shooting repels enemy projectiles which makes it a bit too easy to play. Also you might want to change the colors of some projectile, starting with the player bullets which are hardly visible on the yellow ground. We need way more contrast to better understand what is happening.

Hey, this is interesting. There's a lot to improve, but you have a solid idea of what you want. Consider continue with this idea in the future, polish every detail and make it bigger.

The game loop is here but some important elements are missing like a life bar for the player and the bosses. I really liked the design of the Bosses.

needs more polish but overall quite fun, good effort!

At first I was confused that you could just go pass the bosses, but I guess that makes it realistic, you just climb past them and if one hits you you get thrown down the mountain. With a lot more bosses that could have worked. 

Also, I think you might need to fix your camera script, it seems to not be moving smoothly. 

Also, the screen is a little zoomed in, maybe more room for the player would be fun. 

I don't quite understand the diamonds? If it were all in just one mountain and you had to climb up past them that would be fun.

I also think there should be more sound effects, but I get that there isn't always time for all that in a jam.

What use is shooting for, anyway?

The setting itself is cool and could be explored to make a more polished experience, but, you can just skip the bosses by running to the yellow crystal and if you don't want to do that, you can just spam the left click button until the boss dies, the bosses aren't really a threat and their bullets are affected by your bullets so you can just push the away, there also isn't any variety and the ending is rather anti-climatic.