AirMech is a beautiful mix of an action game and an RTS.
You, the player, take control of a Mech that can walk or fly, has multiple powerful weapons, and looks badass. As this Mech, you can either shoot at the enemy yourself, or create units (such as tanks, trucks, AA guns) to do it for you.
-Single player and multiplayer for up to 6 people.
-The game is really easy to learn and play. Matches are easy to set up and join too.
-You can customize the game alot. Multiple different Mechs and tons of units for you to put on the field.
-Simple, yet really nice, smooth, graphics.
-You get good framerates and minimal lag while playing.
-Lots of maps and different playstyles give the game a high replay value.
-Short games, meaning you can play one or two in your spare time.
While the game kinda has a pay to win feel to it, it's quite easy to get good stuff a little while in.
I'd recommend checking this one out.