Onyx Tempest is a portrait endless action game. Drag the probe along a glowing tempest vein, dodge lightning bands from both sides, and collect onyx shards for score and combo chains. There is no final level—only rising storm tiers and a saved best score. The main menu offers Start, Help, and Quit (with confirmations). During play you can pause; when lives are lost, the game over sheet shows current and best scores and the only way forward is Main Menu.
This is a casual game.