Thanks for the info!! Just now I've compiled my first rom for game boy. I'm studying all these specs. At least, the two sprites only have 3 colors (more alpha color). Keep working. Thanks.

This does not fit into GBC restrictions.

You have to keep in mind that you only get 8 4 colour palettes for your background tiles. And each 8x8 tile can only be one of those palettes. You got tiles which have more than 4 colours and a lot of things that are totally off grid. You then get another 8 palettes for the sprites, which are in effect 4 colours too, but one of them is the transparency.

There are more details to keep in mind, such as number of sprites possible total (40) and max per line (10).

Tiles and sprites can be x and/or y flipped as well, which saves space on the rom as well as in ram. There also is a limit to the amount of tiles you can have in ram, same for sprites.

Another thing is that the GBC has 15bit colourdepth, meaning instead of 256 steps for every channel you only get 32, resulting in 32768 possible colours to choose from.

So yeah, if you want to work on a GBC game you have to familiarise yourself with these specs and work with them.

Other than that, neat mockup.