For the record, this was my first time playing this demo.
The boat was definitely the funnest part, would love to see the game more designed around that. I think it was the chieftans camp where there are several canal like stretches of water that you can sail down? Has the potential to be really cool, moving around and taking a chance stopping off at each section, or continuing on to preserve supplies.
I think my main criticism would be some of the level design, I could snipe a lot of enemies from halfway across the map, and although the boat was fun, some of the ground movement got a little tedious - although I liked the glide mutation. I think if you gave a thought to some vertical level design, mixed with more movement abilities (superjump? dash?)so you can jump and glide between cliffs and buildings, in more confined areas so enemies are more of a threat, it would feel really fun. Maybe you could add fog to the game too, it would go a long way to prevent that empty look some fps games sometimes have, and would help with the previously mentioned line of sight problems.
Another problem was to do with collisions and perspectives. Enemies feel like they have a very long reach, and I noticed that my guns clipped into a wall whenever I walked against it, maybe the player camera is too far back? I think the machete animation should basically extend to the end of its collision area to give a better idea of distance aswell.
I think the UI needs spacing out too, moved to the edges of the screen and split up - put the health in the top left, ammo bottom right etc - it's all bunched up atm. A very nitpicky thing too, but for whatever reason, everytime I go to reverse the boat, I look at the screen and it looks like it's saying CTRL V to go down, when it's just CTRL and the down symbol. for whatever reason, my brain tries to push CTRL and V almost every time. Dunno if it's worth changing or not, but thats just me.
I'll refrain from going into too much on the graphics as I assume a lot is placeholder stuff? Hope you go with the low-poly pixel art look like the weapons as it's quite easy to make and would tie everything together. Could maybe also add some more sound in the mix, seagulls, ambient music, etc. The sound of waves was quite overpowering.