(MD) Ecco the Dolphin

Action adventure game developed by Novotrade and published by SEGA on Megadrive in 1993.
The player controls Ecco, a bottlenose dolphin, and has to solve the mystery regarding a strange waterspout that sucked all marine life up.
During his journey Ecco can perform attacks by ramming to enemies at high speed while singing allows him to speak with other cetaceans; as a dolphin, Ecco needs air so it is necessary to go surface or find air vent to prevent the air meter to run art and start loosing Ecco’s health rapidly.
Ecco was highly praised at the time of its release for responsive controls and smooth graphics.