Perfectly described. 
Probably a micro-awakening or a FA, then a SP or a dreamt SP, then a LD. The fact you had in the same time images which looked like HI, and that they remind of a video game let suppose it may be a false SP. You can find a similar experience in my DJ here; and another curious one that semt clearly to be a false SP.
And about possible confusions between micro-awakenings and FA, you can read here a case when it was quite impossible to distinguish between them (even after having woken up, I mean).
All this isn’t such obvious indeed. 
This topic is a split topic, it continues in part VII here 