Well to be blunt, this really just looks like the classic iOS emulator GBA4iOS, with unavoidable advertisements thrown in for good measure. This comes from a developer with an extensive library of apps ranging from barcode scanners to money trackers, all oddly four years old. It comes across as a quick cash in while there are no other accessible alternatives and it isn't something that should be supported, especially as more feature-rich and actively developed emulators like Ignited have been rejected as spam.
If you are interested in emulation on iOS I'd encourage you to look into sideloading, with apps like AltStore making the process surprisingly painless nowadays, and allowing you to install up to two other apps alongside AltStore itself. This comes with a caveat that you need to check in with a PC every seven days to keep your apps playable, but it's a price worth paying when you consider you're getting ad-free emulation. And ad-free emulation that supports both DS and N64 games with no issues.
Emulation on iOS can actually be pretty great!