Manual Review :
In commerce_order_types.install on line 11, No need to defin...

Manual Review :

1. In commerce_order_types.install on line 11, No need to define $schema = array(); but lot of people prefer to write it for more readability. So its up to you :)
2. In commerce_order_types.install file, end file with 1 blank line.
3. In commerce_order_types.install file, May be you can write more description of commerce_order_types_schema() function. What that schema is for and what kind of data it stores.
4. In commerce_order_types.module file, end file with 1 blank line.

Regards,
Chintan Vyas.