Pretty neat little perspective for an action game
Basically every attack could use some variation or juice or sound effects, even placeholders
The shield could be limited a bit with a timer for how long it could be up, otherwise obviously it would be overpowered
The stun gun seemed to have too long of a cooldown imo for what it does
Changing the roll to Shift instead of ctrl would be easier to reach until you get customizable keyboard controls
I fell off the map in the obstacle course room. Having it put the player back into the arena if it falls below a certain y level should be standard even for demos
Once you start polishing, it could have some potential depending on where you take it since it is just a little tech demo.
Using the teleporter while in the spirit world teleported me into a wall or something so I had to exit the demo again
Having the teleporter as an item also can lead to the player accidentally using it instead of another intended item like a grenade, which sure, it's the player's fault, but it shouldn't really be an option especially if there's only one slot for secondary weapons and a teleport item can just take you out of action AND the middle of a dungeon