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Please rate my grammar

Little Bobby Tables (1079)
Im building a JIT Compiler and just started the lexer, but wanted to do the grammar first to make things easier. is there any way i can make the grammar any better?

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    Grammar:
        IDENTIFIER     [_a-zA-Z][_a-zA-Z0-9]*
        VAR            \$(IDENTIFIER)
        MULTLINESTRING (\"\"\"[^\"\"\"]\"\"\")|(\'\'\'[^\'\'\']\'\'\')
        STRING         (\"[^\"\n]\")|(\'[^\'\n]\')
        INTEGER        [1-9][0-9]*
        FLOAT          (INTEGER\.INTEGER*)|(\.INTEGER+)
        BOOLEAN        ("True")|("False")

        ==================================
        Token :: StatementList
               | FlowBlock
               | LoopBlock
               | Function
               | Null

        StatementList :: Statement ';' StatementList
                       | Null

        Statement :: "import" IDENTIFIER
                   | VarList
                   | Expression
                   | IDENTIFIER '(' ArgList ')'
                   | "pause"
                   | "clear"
                   | "quit"
                   | Null

        VarList :: VarList ',' VarList
                 | VAR
                 | VAR '=' Expression

        Expression :: Expression Operator Expression
                    | '(' Expression ')'
                    | VAR
                    | Datatype

        Operator :: '+' | '-' | '*' | '/' | "**" | '%' | '!' | '~' | '^'
                  | '&' | '|' | "==" | "!=" | '<' | '>' | "<=" | ">="
                  | "&&" | "||"

        Datatype :: MULTLINESTRING | STRING | INTEGER | FLOAT | BOOLEAN

        ArgList :: VarList
                 | Null

        FlowBlock :: IfChain | SwitchBlock

        IfChain :: "if" '(' Expression ')' '{' Token '}' ElseIf Else

        ElseIf :: "elif" '(' Expression ')' '{' Token '}'
                | ElseIf ElseIf
                | Null

        Else :: "else" '{' Token '}'
              | Null

        SwitchBlock :: "switch" '(' VAR ')' '{' CaseList Default '}'

        CaseList :: CaseList CaseList
                  | "case" Datatype ':' Token
                  | Null

        Default :: "default" ':' Token
                 | Null

        LoopBlock :: WhileLoop

        WhileLoop :: "while" '(' Expression ')' '{' Token '}'

        Function :: "function" IDENTIFIER '(' ArgList ')' '{' Token '}'
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