Hi there! I am still really enjoying this port. Apart from the new menus, what differences are there between .81 and .83? Should I be hunting for tunnels and new weapons yet?
There are no tunnels yet. Take a look at the Development Log, found at the bottom of the text on the main page:
Mega Commando - v0.82b - Mega Commando by MXRetroDev
Mega Commando - v0.83b - Mega Commando by MXRetroDev
PS.: The tunnels and new weapons will appear in a couple of days.