I really like the atmosphere you managed to put together from the tileset! The ability to look around was nice for that, though I found the controls for doing so very finicky and I usually preferred actually playing in the top-down mode.
Without rules enforcement or competent AI, the single-player gameplay is basically meaningless; if you want to win on your second turn you can, otherwise all you can do is hope the AI doesn't decide to move onto your king. In multiplayer it's probably more reasonable; real-life chess doesn't really have rules enforcement either after all. I think it could have been better to lean more on that and allow more manual control so players would be able to make advanced moves like castling and en passant as well as undoing moves if all the players agree on it or custom rules and board setups.