heya , I love the quake like movement but its very op. You could make the game more fun by restricting the movement at the start but building up to more mobility through powerups like: speed, jump, dash etc.
Also, having 3 choices of upgrades every round but restricting players to pick only one (vampire survivor style) would provide more player agency and let them build their playstyle. And, removing completely any wait between picking up the item and the start of the next wave would really improve the pace.
Overall cool prototype bravo Marianne !