Nice work, nzeemin, and a good first step in a direction I think many Dingoo owners will enjoy. There have been many requests for Vectrex emulation. Thanks!
So...right now, it just goes right into Mine Storm? No way to select other games yet? I have a big selection of Vectrex ROMs waiting to be played on my Dingoo. Woo-hoo!
Also, for the future, keymapping would be great. I'm a big proponent of adding keymapping to emus, apps and games, since one of the first things I do when I play a new emu, app, or game is try to map heavily-used functions off of the A & B buttons and onto the X & Y buttons. The reason is that A & B are already heavily used by the OS itself, so I always try to prevent extra "wear" on these buttons.
A "nice-to-have" but totally unnecessary feature would be a selector for applying the color overlays the Vectrex system came with.