For a first attempt at pixel art, you did a pretty good job. The character matched the rest of the background's resolution and what you have is a pretty effective and complete look, you could add details in the blue areas to indicate what materials it's made up of or just leave it as is and be just fine with how the playable region looks. The navigation mechanic is fun, and I like the way the little robot braces for impact every time he's falling down... Kinda reminds me of BMO from Adventure Time
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Thanks for the feedback! Making the artwork was definitely the hardest part of this process and it's sick to hear it turned out ok. The tileset is where I struggled most, so I really appreciate the tip! I tried to give it some kind of texture at first but the color palette I was using made everything I did just make it look worse. Would you recommend making your own color palette or should I have just picked one with a bigger selection of colors? Or is this just a skill issue lol?
A tip for color pallets is to generally start out with either a warm or cool palette (Or both, you can use warm and cool colors to reflect light and shade.) Not really a rule but it'll just make things faster when you want to get some basic shading done. You could also start out in gray scale, if the key thing you want to get across is a lot of contrast but always shift hues (use complementary colors like yellow and purple)... You want the art to look vibrant so also avoid desaturated colors.
But those are just some rules, always use some form of reference for environments to get an idea of which colors you are going to use and always experiment to find what works for you.
There's tons more that goes into this stuff if you want to look up color theory, but for pixel art I'll also recommend you check out Pixel Architect and Pixel Overload on YouTube for more comprehensive tutorials.