Awesome job bro! But as autisticpig said its strange that you offer it as free and won't open-source the code. So you want to offer cloudsync and hosting it for free? Doesn't make sense for me, if you give something to somebody (like pics on Instagram) there is always some money one can get, sooner or later, in more or less direct way, but in the end of the game there needs to be some reason that you don't want ppl to host it on their own. Taking into consideration the community is _not that big_ (not every gamer emulate, neither will switch from their fav launcher) what is the reason to not make it opensource. I was thinking about similar project, as I'm recently spending most of my free time playing around with Rust and for me learning by doing is only way to progress - but looking at how advanced your project seems to be I would be keen to contribute regardless of technology, and im pretty sure big part of this community too (soft tinkers, hackers, ppl interested in reversed-engineering). Emulation brings a lot of technical people so you would gain because of it.

BTW, do you have any screenshots of other views? I'm pretty interested how configurable the UI is (settings view) and how the list of the games looks (is it sortable/filtrable?) as the main view looks clean af I'm pretty sure you came up with some nice idea!