I've not played any Metroidvania so far, so, I think I'm not the right person to give any comment on it, but ... you guessed it... this is the internet.
I liked the game quite a lot, great assets and very good gameplay. I think the main issue is that music is completely missing, which would add a great sense of atmosphere to the game. Also, I don't know what to to with the monster in the ice spikes room ... I suppose I should find out somehow, but I didn't feel like puzzling at the point. I think it's not an issue with the game, but rather me not being part of the genre for a reason, but you can judge that better.
Good job!