Played it and i agree with most of what Carnivac said. The pixel art is pretty good but the complete lack of animation is a bit of an eyesore.
I quit the game around the same place as Carnivac as well. Later section of Level 2 although before the dash jumping i suppose. I tried many times and just go frustrated with it. There are way too many enemies that require too many hits. Also it feels minimal with just the bare basics of an action game. you only get one short range attack and that's it? There's not much depth to the game play here.
Overall I have to say I don't like the design at all. The game is challenging but not in a good way, in a frustrating and annoying way. The dash barely helps at all, it usually leads to getting hit more so this game comes down to a massive grind with checkpoints that have no visible "point" and are spread far apart.
The enemies that follow you around are the worst, the bigger ones take 3 hits and in that area in Level 2 it gets really bad, having just two or three of those enemies is a nightmare. since they can stand inside your sprite, it makes hitting them impossible you simply watch your character die. This is very difficult to avoid when two of these guys are running at you. The delay between attacks will almost ensure that one of them ends up inside of you. Enemies in this game are just too generic, simple and only challenging due to the high amount of life that some of them have.
Level design is awkward too with way too many pitfalls just for the hell of it. Level 1 barely has any solid ground, there's a lot of thin platforms that look strange and don't add anything to the challenge either.
My final thoughts on this game is that it certainly has somethings going for it but it's frustrating and very very traditional design limits it's fan base dramatically. Only hardcore NES fans would probably find this experience enjoyable but most modern games are probably going to quit pretty early. There isn't much to keep us fighting through the repetitive and simple design, no new or interesting mechanics are brought to the classic formula. It ultimately feels like a generic NES action-platformer that doesn't compete with the classics at all.
I hate being such a downer here but that's my opinion. I really wanted to like this, I love retro platformers, especially those with dark Castlevania-like themes but the design isn't impressing me much.