The gameplay was okay, but I feel like the style could be improved a lot. I really like the main design for the character and sprites for them, but everything else just felt really out of place. It's important to make sure all the assets look right together, and also in my experience it is generally a lot better to make different sprites rather than scale down existing ones. I'm guessing that a lot of the art was taken from asset packs so I'm willing to give it a pass, but in future games please give more time to the style/presentation of the game.
As a side note, it's a generally good idea for indie platformers to have some sort of main mechanic or gimmick that isn't seen anywhere else, even something small could make the game feel more special.
I really hope you revisit this game however as I feel like it could become something special, and it can definitely be improved from what it is now!