I love the Gameboy style aesthetic so much. It tugs on all my nostalgia heart strings. I also greatly enjoy challenging and difficult games (Super Meat Boy, Electronic Super Joy, Dark Souls, etc.) This game has a lot of potential, and right now I think the steep learning curve is hurting it. I intend to play more but after nearly an hour I still haven't gotten past the first level. I think it is simply too busy and there's too much going on to adapt to. Not to mention the time between death and respawn gets painful. I think the bar for initial challenge needs to be lowered. I also spent a lot of time not clear on what killed me. Part of it was due to me not registering the spikes on the level or the falling projectiles. They too closely matched the color of the background and environment. I think it'd help to have them pop a bit more, make them black like the fish or something similiar so they stand out.
I hope this project continues to grow and can find that sweet spot that makes challenging fun. All the best of luck on your project!