They specially promote GBA emulation because pretty much no device on the market has a screen with a good fit for GBA. They either have the wrong aspect ratio or wrong resolution, very often both. This device interest me a lot because of that.
Every time something wrong happen to an open source over night, there is a wave of useless forks created by people who want the recognition without putting any effort. Just wait some months, a worthwhile fork will eventually emerge.
Ah yes, Nintendo master plan is obviously to cripple the sales of their most popular hardware ever by porting their game on other devices. Brilliant idea my dude.