So I think this game needs some more difficulty. I see there's supposed to be a forest, but I'm not sure that would fix the issues. (I see you only had 6 hours, and its your first jam, what you've made is pretty damn good considering that, I'm just trying to be thorough)
1. No barrier preventing you from falling off the map. (Maybe if there was supposed to be a thick treeline there so the forest working could have fixed it)
2. The Counts can lose track of the player if they get too far away, which you can take advantage of by shooting them from far off.
3. The Counts should start shooting at you from further away, as it stands it's pretty easy to just back up and take them down with no resistance. Maybe the bats could be fast but the Counts have longer range? Something to differentiate the two.
4. The cursor not being locked is a problem, but I see you already know that.
5. No sound effects makes it feel a lot worse. The gun felt pretty meh to use because of it, and just adding some punchy shooting and clicky reload sounds can really make a big difference there.
I think this could be a cool experience, you made some nice designs for the Counts, there's just some big issues preventing it from being super engaging. I hope you take a crack at fixing it up after the jam!