Pikan is a free for all, 2d shooter and similar to games such as Diep or Doblons. Here instead of using your body to consume opponents you instead fire projectiles to try and destroy unsuspecting victims and consume them. Just like a lot of other io games you start off very small and with only one ammo to your name, there are blobs/food all around the map used to steadily grow your size or you can get a juicy boost via killing a player and eating the orb they drop.
On first look Pikan seems to require quite a bit more skill than the conventional io game as the only place you can deal damage to an opponent is a small section of their head, anywhere else and your shot will deal no damage and ricochet. Fear not however as your ammo will replenish shortly and you can soon shoot again. As you gain size from eating the passively spawning food or the orbs dropped by opponents you will gain more maximum shots stored, you will also increase the size of your triangle and your vital spot making it harder to avoid enemy players projectiles.
All movement in game is controlled by mouse movement with the head of your triangle following the cursor, shooting is done by left clicking. All projectiles fired will only travel in a straight line from the location you fire until they hit an opponent or travel their allowed distance before stopping, if your shot connects with the weak spot on opponent you will get your ammo back instantly.