This game was so much fun! I like the chaos and nonsense of everything!:) I think you could improve the mechanics, for example it's not obvious why I should use a double jump that rotates me (but it was fun anyway). Also, the coins look kinda artificial, there was no real use for them in the game. The theme doesn't feel very well presented either, but that's ok, the game was still really fun!!
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Yes, you can spend coins on some absurd upgrades, like buying Curiosity to make it easier to slide on its wheels...
Double jumping can improve your score, like in scating games... Epic tricks (hitting a cow brought to Mars by aliens) also increase your score.
You can also add random events, such as a Martian invasion, so there is room for your imagination!