I notice in Co-Op, the VIP mission becomes extremely difficult because of how quickly he dies to the zombies. They do too much damage to the VIP, and the large number that spawn makes it nearly impossible to defend the objective. A decreases in the number of zombies on VIP would help balance the difficulty a bit. Maybe I just had a disorganized team though...
I like the pet system, but maybe more could be added. It'd be great to buy armor for your pet so they can last longer in battle along with getting better stats.
What would be cool for the energy regen thing is for the player to get 1 or 2 each day they play or the player has to buy them from the shop with money they earn in-game.
A good way to level up and gain Dexterity after level 15 is Demon Battle. The demons give a good amount of experience and you fill the dexterity leveling meter rather quickly. The Super Meditation Spot is best used for when you want a balanced character and all of the others are used to level 1 specific stat.
Pilot: Alright, time to kick some ass. Wait... no one told me I had to kill enemies on the ground! AHHH! *crashes into ground* USS Manly Captain: It seems we had a girly man in our squad. At least he doesn't live anymore. *pilot respawns* What's up?
Dear creator, there appears to be a glitch restricting gameplay. Some people are stuck playing 1 kind of map. I cannot play a different map than Iglu, which is known for much glitching. Please respond why this is happening ASAP.
I can't play anymore. I literally played all day. I am going to sleep 2 days to make sure I don't do this again. Great game, but it is just do addicting. 5/5.*passes out*
Don't sell your undefined bluegills. This is a legendary trap for most people.