Great game! Like you mentioned, our games really were quite similar! The music was great and the simplicity of the art complimented the gameplay really well. The movement felt responsive, and there wasn't anything that felt unfair. I felt like the character was a tiiiiny bit heavy, but that's honestly probably just my personal preference.
As for gameplay improvements, I think there are some minor details that could be altered/added to make the experience even more fun. I felt like the radius of the sprite mask could be a bit bigger just so it's a little more forgiving. Another thing is the death feedback. I felt like the sound effect for the death was a bit harsh to the ears, especially when coupled with the music, so I'd suggest adding something a little softer both in volume and intensity. You could make up for the indication that the player died with particle effects or a screen shake. The final thing is that I'd suggest making moving platforms automatically move you horizontally. To me, it seemed intuitive for it to move for me so I ended up dying twice because I wasn't expecting it to move without me (The first time was because I didn't know, and the second time was probably me being an idiot and forgetting).
Regardless, these suggestions are pretty minor and the game is plenty fun already. Great job!