You know, if this was done in less than two hours, that's mighty impressive. Please take the score as a reflection of this being an unfinished game with no ending, in which you run out of content in three minues.
There's kickass music, fluent platforming, character animations, moving platforms, collectibles, background, AI enemy – and a secret room which was awesome to discover. And I love the messages in the pits.
As for things to consider:
– the main goal of the game, i.e. have a way to finish it (obviously)
– I would expect the collectible mushrooms to do something eventually if you track them down, either as a currency, or cause some other effect. But if they are important, please don't reset them with death, as falling down a pit in a platforming game is more or less expected to be common.
– Pixel size consistency. In a pixel art game, you should strive to have all pixels the same size, here it's all over the place (e.g. the protagonist vs the tiles)
– When you change the colours of the environment, I'd expect the gameplay to make a shift as well. E.g. you start on the grass with easy platforming and enemies, and “ascend” the mountain to a snowy area with harder platforming, harder enemies or I don't know, slippery ice.
– Look up the “squash and stretch” principle; it could help you improve the protagonist's jumping animation
– The text feels a bit “blurry” and is harder to read, and the font size + colour is all over the place
Overall there's not much else to say, but it's an extremely well-done prototype, so I hope you continue and do something great with it. Good luck!