I have to say this is the best programmed hombrew game i have tried since i have the gp32.
I suggest you some things to make this better because it is really really good programmed.
There are two small graphic bugs, the first one is when the fog is disappearing, the other is the font used in element descriptions in the game.
I also recommend you, if you want to release the game under GNU GPL and begin a project in SourceForge, i'm sure that some people would want to help you in graphics, programming and music, but this is only your decision. I think that because it looks like a good piece of software.
Greetings.