Only way I can win some of these is doing the same thing over and over until I get it just right. These kinds of games should require intelligence, not luck.
Nevermind... found a good strategy ***having a hard time to get past day 2-3? Well, make sure that you don't get hit EVER - even if you gotta waste shotgunbullets on small birds. Cleaning is much more expensive than bullets. You can ignore birds in the lower 1/4 - 1/3 screen, they cant hit you. So on day 2 get a shotgun and lots of bullets for it (for loners keep having 50 musket ammo). You should always try to have like 50-80 shotgun ammo in the beginning. On day 4-5 you should be able to get the pumpgun - so use pump (main)&musket. A few days later, you get SMG power with like 400 bullets/day and can start to upgrade your defense (which is quite expensive).***
 "Sydney Shark"){kind=icon}
 "Neon Rider"){kind=icon}
 "Fancy Pants Adventure: World 2"){kind=icon}
 "The Space Game"){kind=icon}
 "Shopping Cart Hero 2"){kind=icon}
 "Super Crazy Guitar Maniac Deluxe 2"){kind=icon}
 "Feudalism"){kind=icon}
 "Continuity"){kind=icon}
 "Bloons Tower Defense 4"){kind=icon}
 "Imperfect Balance"){kind=icon}
 "Red"){kind=icon}
 "Frantic 2"){kind=icon}
 "Toss the Turtle"){kind=icon}
 "Pixelvader"){kind=icon}
 "Feudalism II"){kind=icon}
 "Medieval Rampage 2"){kind=icon}
 "Damn Birds"){kind=icon}