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Chessimilation

Assimilate every last one of your opponent's pieces into your own army to win! A battle of the mind to claim complete victory and assert total dominance! Only the player with the superior strategic smarts will win!

The gist of how to play (full details in in-game Notebook):
Each piece has a diagram of how it moves on it; a 13x13 grid with a bigger red circle or cyan cross at the center, and smaller red circles or cyan crosses indicating where the piece can move to if the center represents its current position.

The simple ones teleport regardless of pieces 'between' its current square and destination, while the fancy ones indicate a pattern; of which all earlier 'steps' must be unoccupied to reach a later 'step' in the same 1 move. If the pattern reaches just over the edge of the grid, it extends to infinity.

You can move a piece to an opposing piece's position to take it, and draw that opposing piece to your hand; converting it to your own. On any turn you may place a piece in your hand onto any empty square anywhere on the board, instead of moving a piece you already have on the board.

If you have no pieces in your hand and your opponent takes your last remaining piece on the board, the game is over as you have lost to them. Take every last one of your opponent's pieces before they take every last one of yours to win.
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Credits due to Ivan, the maker of the "Beginner Shogi" workshop item, for the piece model/mesh; art overlaid on them is my own. Credits also due to Gizmo, the creator of the "Gizmo's Chess Clock" workshop item included.

Images (click to properly see):
1st; Showcase of all of the pieces
2nd; Informative Wheel diagram
3rd; Alt graphics of start position