That and a bit of QOL.
This dev has shown they can do amazingly with the latest GMTK 2025 entry they've made, so i'm sure they have the experience.
Why only arrow keys and Z instead of WASD and space? Those controls are much more standardized and you can have both with such a simple control scheme.
Also show, not tell. The tutorial opening every time is very annoying and it could just be opened with a ? button and the game can be designed to show how to play.
I think at first we should get a slower speed too which ramps up to the current speed, just to ease off the learning players at the start of a round.