Nice little metroid-vania, the first I have seen for now! Graphics and audio are really well put together, the atmosphere is nice.
The game felt a little unfair though (some platforms are located at the maximum of your jump height so it is tricky to reach them and the enemies chain-pushing you backward as you enter their hitboxes is pretty frustrating).
Is that only me or the boss doesn't disappear when you kill it?
Overall, a very solid entry, especially when having in mind the short deadlines. It reminded me of my childhood games, I spent a good time! Congrats!