It's all fun and games until someone loses an ear!
This simple Smash TV clone managed to implement weapon upgrades in a way I found incredibly enjoyable. Mainly because no build order is particularly useless. I found shotguns very entertaining, but SMGs really kept me alive while saving up points for that gatling laser.
While the weapon stats are all over the map, each gun really does improve upon the previous gun in that branch of the tree, and all the capstone weapons are ridiculously overpowered. Perhaps more importantly, they all feel deadly, even your starting pistol in the first room.
My favorite part of this one has got to be the audio. The cheesy carnival muzzak becomes increasingly atonal after a few bats to the head. It becomes noticeable around 60% health, culminating in total deafness when you're down to 10%. It cracked me up when I first noticed it, and it never got old.
While lacking the visual quality, scrolling, and money-grabbing of Daytraders of the Dead, the guns are so good, I almost feel like the long-term payoff is higher in some ways. Good stuff!