It's pretty ambitious project, I gotta admit I am pretty scared when I saw the game immediately lag my pc before I even streamed. We got through it alright thankfully. I will comment with the alpha build in mind.
This game has a strong AAA look, I think in many aspect its graphic can compete with that, as a streamer I definitely would encourage start optimizing the game, start finishing up the UI and the menus, it took me a lot of time to find the menu in the "Future" section of the game, and the Past section part was also not quite clear enough sadly. You can see my confusion on the stream.
It should have been as simple as a single key prompt to show me where it is so I don't need to find it smashing keys. There are a few more things like enemies coming in inconsistently, and due to the lack of sfx not sure if some hits landed, also no idea what the goal of the game should be other than fighting enemies at the moment. I would need more instruction on that.
The part of the Future with the zombies and the option of the car running them over was definitely fun for me.
FYI, I suggest change the banner to a human character, or the guy with the shiny weapon car, or pose your future guy with your past mc, the current banner/icon would not attract audience because people are naturally more drawn to faces, a portal swirl is not a very strong draw as most people would pass it as an item in their mind.
VOD, yours is the first one: https://www.twitch.tv/videos/1817769943