So I just ran a test quick, with 100 gems in the slot machine, I just got 715 gold(18 hits min), 10 Zombies, 10 Skele, 14 Nuke, and 4 Extra Bombs. Now that doesn't account for + gems, which turns out to basically be +2 gems as you use one to get 3, but that means that I won at minimum of 46 times out of the 100. Basically what that does is make it that you can slot machine your way through the game with little to no effort at all.
I really don't understand how this game is supposed to make sense, you can grind and upgrade your character as well as the NPCs but it doesnt mean anything on half of the missions, for example I am given a sword that is like tier 2 when I have purchased the tier 4 of it. Combine this with, what honestly, is some of the worst AI I have seen in a long time, if not ever, and it makes for a basically unplayable game. I really did try to give it a shot, even came back after taking a break for a day and nope its still pretty damn unplayable.
So something I kind of have been wondering, unless you are aiming your cannon at the top of the screen, when will it ever benefit you to have your max bullets higher than like 10. I beat the Devil and dont think i ever went over about 7 on screen at a time.
I am not sure how you worked the turning and weight balance on the car but it would be awesome if you could have something where the game could show where the center of balance on the car is.
It would be awesome to have a more specific number on what the upgrades do. For example is one point of weapon +10% or +20% or something else entirely and also if the numbers go on a constant scale(10/20/30) or a nonconstant scale(5/15/30)