The style of gameplay should be familiar to anyone who's played "Doom". The control scheme should be familiar to anyone who's played "The Binding Of Isaac" - or, going farther back, "Robotron".

What's shown in the video is the first 4 minutes out of 3.5-4 hours overall of gameplay that has already been created. Some tweaking is still pending for the map in question, namely in the area of green key.

I may create simple 2-frame animations for monsters yet. Not sure.

As for market demand... it's not a concept I subscribe to.

I have two other games, one of which is in engine prototype stage and its gameplay mechanics do not fall into any established genre. It's not an RTS, it's not an RPG, it's not a hybrid. It was inspired by a TV show. The market cannot possibly demand it, because it has no concept of it at all. But it will be made nonetheless.