FRAGROOM: Defenders (PC)

Fragroom by District Zero
Fragroom: Defenders is a fast-paced cartoony session PVE (Player-vs-Environment) shooting game with straightforward gameplay. Survive the hordes of zombies keen to destroy your small store-based shelter. Aim, shoot, change position, grab a bonus, repeat. Invite your friends over and let the fun begin.

The current version includes a list of cool features, such as:

7 playable rounds (Tower Defence Mode)
4 customized destructible meshes
6 customized weapons
9 different enemies
Lots of character's skins
In-game voice chat