This OOZES charm. I'm always a sucker for Metroidvanias and thus this gets all the love I can throw at it, it's an overall fun game and I'd play it over and over again if there was more coming to it.
I'd wish there was some more music than the same exact track playing over and over again though, but at least the music playing throughout was a pretty good tune, so I'm not going to complain that much.
Controls took a while to get used to, and for here I'm mainly talking about the walljumping powerup, because I didn't know you had to press left or right first before pressing the jump button. The only other complaints I have are mainly just nitpicks (and just relegate to me being dumb at Metroidvanias, despite loving them... go figure) and it also took me a while to find my way in the map. Luckily you are one good game designer and it wasn't as hard as I thought it'd be.