It look like a excel and i try to add almost all functionality that has excel.
Isolated cell text formatting.
Cell-to-cell relationships through formulas like B1 cell is depend on A1 cell by some formula like A1 +10 so whenever A1 cell change then B1 cell also change according to A1 cell data.
Download and upload sheet capabilities.
If two cell are related to each other then it will also show the cycle and give you a warning when you connect to cell each other during adding formula.
We can cut,copy and paste wherever we want in a sheet.