I think this game is pretty interesting so far and has a lot of potential. I only made it past the second large temple level (the one shown in the first screenshot) so my feedback is based on the game up until that point.
-The art is great. The first big open area really impressed me with it's weird ethereal atmosphere, and the levels inside the temple are appropriately moody with the dark corridors. The environments make great use of contrasting darkness and light, and some of the really huge canyons and temple corridors are just a marvel to look at.
-The gunplay is generally pretty good. Although I thought the weapon balance was a little weird. The shotgun is clearly the most versatile weapon and my go to for like 80 percent of encounters, with the sniper rifle being amazing for taking out anything from a distance. The flare gun has it's niche uses, and the summon weapon is good for baiting enemies and playing defensively in certain areas. I think the lack of a good machine gun is maybe an issue here. I realize that the smg is intended to be kind of a subpar fallback weapon with it's one upside being that it has a massive amount of ammo, but I think a good automatic weapon would round out the roster and feel good to use in those big hoard encounters (as opposed to just using the shotgun all the time).
-I think the movement is interesting but also one of the roughest parts of the game right now. It really fun to slide jump and build up huge amounts of speed. And I think the jumps being floaty is also a good idea given how enemies swarm you. But I think a big issue is that when you air strafe side to side, or front to back it feels really jerky. Like when I jump to the left I can press right and it immediately sends all my momentum to the right. This unfortunately make jumping feel a little hard to control and it becomes more and more of an issue the further into the game I get, since trying to jump around while avoiding the hoards of enemies can feel very unwieldy. And trying not to fall off ledges (especially on smaller catwalks) also feels like a bit of a chore since my jumps feel very unpredictable. I can tell this game wants to be like Serious Sam sometimes and sometimes it wants to be a more methodical exploration shooter but both feel kinda hard to do when I don't feel like I'm in full control of my character.
-Moving through water is really rough right now. You go so fast that it's really hard to control, and combine that with the fact that it's harder to see underwater and I'm afraid to fight anything underwater.
-The level design is varied and interesting. It has a great mix between dark corridors that you need to explore methodically and wide open arenas where you're free to jump around battling hoards of enemies. The levels also make great use of the different tools in your arsenal here. I like how the level where you find the archer summon is clearly built around baiting enemies from down the hallways into the larger rooms with the water, which are the perfect place to summon the archers and watch them shred the enemies. I also like how the level that comes immediately after you find the sniper is a huge open area where you can make great use of it. The pitch black maze where you can only rely on the flair gun to see is also amazing and genuinely spooky.
-I think the flair gun's light radius could be a bit bigger. I feel like I really have to spam it in really dark areas.
-I noticed a bug where if you pause while in the middle of a reload animation it causes the animation to freeze. You can get it to unfreeze by switching weapons.
-The music is a bit of a mixed bag. I think the levels that just contain ambience sound great, but when it comes to the actual music, it's kinda easy to tell that it's royalty free.
-The weapon lore is pretty cool. It reminds me of Dark Souls with how they give interesting context to what the story of this game is.
Overall I think that if you clean up the movement, make the gun roster a little more interesting, and fix some bugs I think this game has the potential to be a really great, strange, and atmospheric shooter. The level design shows some real intentionality here and the art is really cool to look at. I'll definitely be interested in looking at future updates.