Games like ZeroZone2020

A cheap, rough-edged single-player tower defense game: defend a base from enemy swarms with all weapons from the start, though reviewer play sessions are very short.

Zombie Defense
A single-player RTS/tower-defense hybrid about recruiting soldiers and fending off zombie waves with airstrikes and grenades; reviewers averaged around 8-9 hours and found it fun but sometimes slow with awkward controls.
2016-09-30
- Shooter
- Action