I love the small arena and enemy count survival mechanics. Each enemy and action feels like it has higher stakes when compared to standard survivals. Really brings a more arcade easy to learn / hard to master feeling too.
I do enjoy a difficult game that makes you just want to retry and play again, which you've got - but it ends a little early for my taste so the starting difficulty & scaling would be my main tweak suggestion.
I didn't want to take the reduce recoil because I like the extra speed from boosting away from reds or the edge of the arena.