Played the demo, it was well made overall. I like how they dynamically adjust the music when you enter places (already did this in Shovel Knight).
But still not a fan of the visuals. I get that developers are free to do whatever they feel like, but this is basically GBC but when the constraints were too annoying they simply ignored them. Way too many instances where there are more than 4 colors on a tile. I mean, make a GBC game are make entirely something else, no ? Emulators exist to package and release games on modern consoles.
Also too many different palettes at once on screen, it becomes bloated. Shovel Knight was also "kind of" using 4 colors palettes, but there was an overall consistency to the scenery so everything that was important popped-out quickly. Here, you have to analyze every tile to understand what it is supposed to be and if/how you can interact with it. Could be better. And developing on an actual GBC would have naturally helped mitigating this problem.