Not a particularly ambitious game, but it doesn't really need to be. A simple platformer with Metroidvania elements (doesn't feel quite full on Metroidvania to me, but that's also okay), with some nice music choices and simple but colorful visuals that fit the vibe, well executed platforming overall (albeit with slightly janky moving platforms, but they get the job done as well as the game's level design needs it)... honestly, this game has some pretty good level design.
Wish the ending was a bit more satisfying, but you made an actually complete game that feels pretty cohesive and that really counts for something. This reminds me of Flash games I played growing up, and I mean that in a good way, because I played some really, really good ones.