you made a cute fest! :D
I like the mood! it definitely has the gameboy soul!
but there are some points:
The jump is too long for this small screen, when i jump, i lose where i want to land and i may land on those big spikes (which are a little too big!). but if i had more control on the jump this would be appropriate for the maximum height.
And the music is too short and unfortunately it doesn't loop seamlessly which breaks the mood.
all in all good job! best wishes!