Tested, working.
Download is 1GB, which is huge for a mobile test game.
Game is early access, can be fully completed in 15-20 minutes.
It bluntly asks you to download Angel Legion for a costume.
( I'm guessing by the design its from the same company as Angel Legion)
Feels like a test ad to get you to play Angel Legion, which has no live combat, but turn based.
Not much to the game at all, more of a live combat test.
Feels like a feature they might add in Angel Legion later to try and get players back.