For the most part, seems like a pretty cool game! Definitely has the overall feel of high production values: everything is pretty smooth, polished, and intuitive, and there are plenty of quality-of-life features, such as the inclusion of an auto-fire toggle which is great for my old man hands! Even though the demo is technically pretty short, there's a good variety of biomes and enemies and the general loop is decent.
I gotta admit that I did have a bit of a bad first impression. I felt like I was doing great making my way downwards, collecting resources, blasting enemies and so on...until I got a warning that I had a fuel limit...right when I was running out of fuel! I'm not mad that a timer exists as I think pressure is good, but jeez, you think you could've warned me from the start that I was on a time limit? I tried to race to the exit but ended up crashing and getting kicked to the title screen: felt like a slap to the face, I was so deceived! Warn me earlier next time!
Furthermore, while the demo level does have a lot of surprising variety, without any sense of the long-term upgrading and mission structure, I don't think I can get a good feel of the gameplay loop, which is pretty critical for an impression. It's still ok, but in a way, the minute-to-minute gameplay didn't necessarily blow me away or anything: I think this game will likely be addictive because of the long-term carrot that upgrades provide as well as a story, so without seeing that being present, I'm not sure what to think of it.