Really really cool Project. Shows a lot of potential. I love the whole layout and how easy it is to use. Reminds me of the good old rpg-maker and the opportunity to make actual Gameboy games feels like a childhood dream come true.
Yet although I know and love how limitations can empower creativity, i feel like this is still a bit too limited. Once an rpg turnbased combat system is added to this tool (and maybe some access to deeper mechanics like jump physics and the likes), this will be absolutely amazing.
Keep up the great work!