I liked how the surroundings changed as I advanced.

Gorgeous! Liked very much. 

Great little platformer that teaches us about the importance of graphics  :)

It plays nicely although controls do feel over-responsive at time. 

I like the idea of a gradually evolving world. Reminds me a little of Evoland.

Neat idea and nice art. The jumping is maybe a little too floaty and there could stand to be more contrast between the different types of coins.

It's very good, and it follows the theme pretty well, but most of my criticism comes from the fact that the character is kind of slow, and you the coin's hitbox should probably be more generous. You should probably also have less control in mid-air, and have it so the jump is less "floaty". Other than that, very nice!