Syvalion (Japan) is an arcade game, and the '(Japan)' specification denotes the region of its release. Without further information, we can only speculate about its genre and gameplay.  However, the name 'Syvalion' itself suggests a fantasy setting or a game involving mythical creatures.  Finding the developer and release date would clarify its role within the larger arcade game library and possibly its genre, whether it is an action, puzzle, or other game type.

Syvalion (Japan)

Swimmer (set 1)