Crimsonland is a pretty good arcade style top-down shooter. It has a lot of weapons, perks, pickups and a great diversity of monsters to kill. There are 60 levels in the quest (campaign) mode. The terrain is always a flat open wasteland with nothing to use for cover. For the biggest part, you keep running around in circles, finding and shooting yourself a way out through the gaps in hordes of monsters. There are other modes, like 'Survival' and it is possible to play Quest mode again with a higher difficulty level. But, with so many other games available these days, I'm not gonna spend more time on that.
Zombie Shooter is a mediocre arcade shooter but does have satisfying action and upgrades for weapons, armor and other stuff. The game supports only a 1024x768 resolution. There is a solution to play in Window mode at a higher resolution, but this has a huge impact on the framerate. There is no (XBOX) controller support, the mouse is your primary controller. There is a good variation in zombies and monsters but it gets a little bit repetitive after a while. I know that zombies are brainless, but the A.I. pathfinding in this game is very poor and despite all the weapons and upgrades, this your main advantage in the game. With this you can simple beat the end boss (and only boss in this game). Another issue is the isometric view where the enemy can sometimes “hide” behind or in front of a wall.