Gameplay
Primarily a vehicle simulation game, the player controls one of a number of possible vehicles in order to complete objectives. The vehicle used could be an aerial craft, defence emplacement, or surface craft, and is usually armed with a primary weapon (with infinite ammunition) and sometimes secondary weapons (with either a limited or infinite supply). Incoming was also noted for its arcade style; in particular, the logging of high scores and a "life" system.
There are three different game modes. The campaign mode follows the main storyline in which the player must complete a series of objectives to neutralise the alien threat. Typical goals include transporting cargo and defending allied convoys. Two variants of the campaign exist: "campaign action" purely consists of the simulation missions; "campaign tactics" features the same main missions as campaign action, but with some extra sub-missions. These sub-missions take place in the "tactical display", where the player controls several vehicles and gun emplacements in a similar manner to real-time strategy games.
Either campaign consists of ten missions (referred to as "phases" in the game) in each of the six locations. These locations can also be accessed in the arcade mode. This mode sees the player fight off alien craft while picking up as many "power-ups" (items which confer some advantage upon the player, such as temporary in vulnerability and upgraded weaponry) as is possible. The same mechanics apply to the multiplayer mode, with some slight variations depending on the game type selected. Multiplayer is available in split-screen mode on both platforms in addition to networking and Internet options on the PC version.
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