Good game, but..
The game is good, very nice UI and upgrading system. However, the movement can sometimes put you in a terrible position and makes you feel like you don't have enough control in some cases. The boss battles are unnecessarily difficult and it's almost like the boss can spam moves and basically has 0 cooldown. As a new player on the 2nd level, I feel like a boss battle like that is insane work to pull off. The zombies don't have particular spawn points and it seems like they just spawn off-screen, making you overwhelmed very quickly with no rest period or time for strategy. This also makes the side missions harder to complete, though they are fun.