If you're looking for some kind of specific help to get your game going, I just made a new "Help Wanted" section.
It's actually quite easy to break up repetitious tiling effects even in SoM. With 2 versions of a single floor Piece, each Piece can be rotated 4 directions that's 16 possible "looks" for each floor tile from the player's view. That means there are 256 different possible combinations for any two Pieces. And, if the Pieces are designed to overlap into the adjoining Piece, each Piece's apparent shape is affected by all 8 Pieces around it for almost limitless possibilities. That's just from 2 different floor tile Pieces. Granted, it's harder to break visible wall repetitions, but still not that hard. The first screenshot shows the effects of only 2 different floor Pieces. The second also shows just 2 different wall Pieces. Tiling is not especially apparent in either and would be even less so after Objects are added.
It's actually quite easy to break up repetitious tiling effects even in SoM. With 2 versions of a single floor Piece, each Piece can be rotated 4 directions that's 16 possible "looks" for each floor tile from the player's view. That means there are 256 different possible combinations for any two Pieces. And, if the Pieces are designed to overlap into the adjoining Piece, each Piece's apparent shape is affected by all 8 Pieces around it for almost limitless possibilities. That's just from 2 different floor tile Pieces. Granted, it's harder to break visible wall repetitions, but still not that hard. The first screenshot shows the effects of only 2 different floor Pieces. The second also shows just 2 different wall Pieces. Tiling is not especially apparent in either and would be even less so after Objects are added.