I searched a long time for this upload, as Xobim said, it should be labelled as Single Player… ; I had played it ten years ago, and I found the gameplay uncommon for this game. It left me a lasting memory.
STORY
It is set in a middle of a war (before, and during it) To complete the levels, you have to “talk” with static characters. The story is somewhat consistent, and especially the fact that it takes a central place, although the texts are not that astonishing.
SYSTEM OF INDOORS/OUTDOORS
I found the idea of indoors/outdoors also good: some parts of the level were duplicated, and through a warp, you go in the building. Those warps are above the doors, so you may unwantedly warp in the building.
STRATEGY
To compare it properly, with elements from other single player games, I would say that the difficulty (enemy placement, strategy) is absent there. There are no ennemies but for two levels, where they are gathered in one place, in groups of 50 or 100, and with Spaz you get rid of them in one movement.
TILESET/VISUALS
The tileset isn’t especially beautiful.