Awesome metroidvania!
Great feeling with the double jump and sword shooting. Juicy stuff!
So many unique monsters and bosses. All behaved well too, as far as I could see.
Three things I noted:
1. Would have been nice with some boost upwards or something when you jump up to a room. The screen transitions are a bit back and forth now, made me a little dizzy.
2. Some areas felt kind of empty, no enemies, just an empty room.
3. The jumping was a little weird to me. I'm used to the character stopping the horizontal movement as soon as I release A/D, but here it kept moving in the original direction until it landed. I got used to it though.
Awesome entry, well done!