Okay, I just played it and here's my feedback!
It was very, very short, yes, but it totally caught me off guard! I was not expecting the monsters and they did not disappoint.
The thing with free assets is that some people just use random ones that don't really go together well (I've done it myself in some of my projects) but that's not the case here. Good job on putting together assets that actually go together really well.
I understand this is a very early tech demo (it doesn't even have a title yet), and it obviously still needs more polishing, but you definitely should consider giving the game a story/backstory, add more areas, and definitely more monsters. And chases, that would be amazing!
Overall, I think this has potential and needs to be expanded. Good job on your first project!