Resize sprites, tighten player hitbox, implement smarter collision.

src/bullet.lua

@@ -32,13 +32,18 @@ end
 
 function Bullet:update()
    local collisions = select(3, self:moveWithCollisions(self.x+self.vector.dx, self.y+self.vector.dy))
+   local realCollision = false
+
    for i=1, #collisions, 1 do
-      -- anything the bullet can collide with should be damaged by it
+      -- anything the bullet can collide with should be damaged by it, but it has to hit an actual pixel
       local obj = collisions[i].other
-      obj:damage(self.damage)
+      if self:alphaCollision(obj) then
+         obj:damage(self.damage)
+         realCollision = true
+      end
    end
 
-   if #collisions >= 1 or self:outOfBounds() then
+   if realCollision or self:outOfBounds() then
       self:remove()
    end
 end

src/kani.lua

@@ -53,6 +53,7 @@ function Kani:init(ui)
    self.type = 'kani'
    self:setGroupMask(0x2)
    self:setCollidesWithGroupsMask(0xd)
+   self:setCollideRect(1,12,25,24)
    
    self.reserveCharge = 100
 
@@ -155,6 +156,6 @@ end
 function Kani:runReady()
    local collisions = Kani.super.runReady(self)
    for i=0, #collisions, 1 do
-      -- handle player-triggered collisions
+      -- TODO: handle player-triggered collisions
    end
 end