I quite liked the game. It has a bit of a Dead Space feel to it, and generally the shooting and level design felt nice, and enjoyable to be in. There are some minor bugs here and there(enemies t posing on death, acid resistance not fully working, gaps in level design that let you go out of bounds), but it is obviously understandable for a jam game. I also think it is quite big, which is very nice, and it seems to be packed with content. The atmosphere of the map also feels great, with constant wind sounds and general feel of being on a hostile ice planet, similarly with the amount of enemies, there was always something to do.
However, there are a couple of things that personally bother me. First of all I am not a big fan of upgrades that just give you protection against something, which basically feels like getting a key to a door. They are an understandable upgrade, but still I feel there could be some different design/idea for that, one that could give more than just entrance into new area. Second of all, the indicators for upgrades are not that visible. I was unsure if I picked an upgrade and could only really see it because the texts about needing an upgrade for something dissapeared. There could be some sort of notification at the top of the screen for that. Same when you enter an area that needs some upgrade and you get that writing on the side of your screen. Third of all, the bossfight is really jarring with the entire screen flashing white. I think it was supposed to be thunder? Which did look kind of cool, but after a while it got tiring to look at, and I believe it could be problematic for people with epilepsy.
All in all, nice job! Congrats on the entry, as it is quite fun and unique, because I don't believe there are many 3D games, especially not shooters.