First time playing Acrolyte; Expected great art direction and atmosphere and got just that.
I'm not sure if the underground area the demo takes place in is considered fully finished yet, but I think its "length" could be cut in half. Currently it does not feel varied enough environmentally and a lot of it is running past the same small enemies without much change in scenery. If the level is varied a bit more in the future or the length is cut in half I think this section would be a lot more interesting. As far as the movement upgrades go, I think they were positioned well enough but the the direction you need to go after obtaining the slide could be telegraphed better.
The boss looks very good, but there's something about him that feels a bit janky with regards to getting hit by his body. I'm not exactly sure what it is, but maybe if there was more telegraphing to when his body slams down on you (maybe he moves up first instead of just shaking?) that attack might feel more fair. Also having him be able to be so far offscreen and not getting any feedback for when he's preparing his rush move feels *bad*. It's a very fast attack where he slams into you with his body so if you have him on screen and know it's coming it's hard to avoid but when you also create distance you don't know when it's coming which doesn't feel great.
EDIT: Oh, I also was having issues with jump inputs being dropped on controller (PS5 controller/Dualsense).