Hey!
First of all, great game! I love the pixel art and the music. Also, it was really nice to see the theme there, great job!
If you want some feedback, here's mine: The camera, while jumping, goes to high and you can't really see much, so I think some polish there will be great. Also, you have to find a way to tell the player, visually, what objects he can collide with. For example at one point in the level there was a drawer down and one up, with one I was able to collide but not with the other.
Nonetheless, you did an amazing job with the game. I love the fact that you made it alone, congrats!
I would love to have you playing mine too, if you don't mind of course! ^_^