Really enjoyed this game. The platforming was tight (I think the only thing I didn't like was the immediate killing of vertical momentum when the jump was released, I think just a touch more "bounce" after you let go would feel slightly more natural as opposed to it feeling like you hit an invisible block the instant you let go of space).
I got into quite a groove when I was playing and only got hit when I got to the boss section, which was quite a spike in difficulty but it didn't feel unfair, I just had to learn the rhythms. I beat it on my first go, but it didn't feel too easy, especially since I'm one of those people who don't like games that are needlessly difficult. Let me have fun! Which is what this game did.
The graphics were simple, but suited to the gameplay. I really liked the background elements like the flamingo and stuff, it added that Super Mario 2 sorta vibe to the game. I had a lot of fun overall, so great job!