Very interesting idea for metroidvania and i need to point out how good it looks when it comes to graphics. You used very simple sprites but adding lights and post proces you manage to make really good original looking game, which i really appreciate, well done! I wasn't able to get very far, because there wasn't any checkpoints on the way and when i was dying and starting over again and the run went even worse than before I could not make it :D Its natural in this game type that you need to start from the begining, but maybe thare are some ways: respawn at respawn points and if you want to start from beginig hold "R" for example. I also noticed little flags on the way, so maybe you wanted to do checpoints but do not have time for impementing.