Amok

A mech game developed by Lemon and released for the Saturn and PC

In Amok, you pilot a mech land crawler with underwater capabilities. Armed with various weapons and a HUD display, you take your mech across vast lands, through mountains, and to the depths of the sea. 
 
There are a total of 9 missions, each with a secret area. There are also over 40 different types of enemies and 12 different power-ups. 
 
Two players can play via split screen, either by going head-to-head or working together to defeat the enemy.