I've been playing a bunch of Game Boy and NES homebrews lately and this is one of the best. My only gripe was the difficulty spike around Level 7! However, I persisted and completed 8 of the 12 Demo Levels. Great job!
Thanks for making the video, along with posting the reviews here and on steam! We wanted the demo to start getting difficult so people can anticipate the challenge of the full version :
Ah, that makes sense. Having played the game, I think the difficulfy is just about right. The change in biomes is also cool! Best of luck with your game.