https://github.com/kirjavascript/TetrisGYM/blob/master/src/charmap.asm is currently mapping $25 as a period, but i should be a comma. Period is located at $6f. Also, the charmap is missing entries for the exclamation mark ($52) and question mark ($55). Other mappings, for ^, (, and ) are also mapping to the wrong tiles.
https://github.com/kirjavascript/TetrisGYM/blob/master/src/charmap.asm is currently mapping $25 as a period, but i should be a comma. Period is located at $6f. Also, the charmap is missing entries for the exclamation mark ($52) and question mark ($55). Other mappings, for ^, (, and ) are also mapping to the wrong tiles.