solid entry!
I think it would have been really good to see what the potential rewards / punishments were for the high risk and low risk options. To really get a sense of what you were risking.
on a more complex note I think games often fall into the trap of just doing 'number up good, number down bad' it would have been really neat to see something a little different from the rewards like a cool new weapon or a modifier to make the zombies all behave differently. Something that adds a little spice and makes the overall experience more engaging.
I think the art and presentation was all pretty great! More feedback when getting hit is always good, sounds, vfx, a knock back effect on the player (all that jazz)
Overall a good entry and a great attempt at a top down shooter type game well done