Ryau the Jellyfish 4

Ryau the Jellyfish 4, or Ryau IV, is an 1989 side-scrolling video game.

Plot
Farmer Crispy has plans to destroy the world and space, and be the only thing alive.

Gameplay
Instead of improving on Ryau the Jellyfish 3's gameplay, it instead improves on Ryau the Jellyfish 2 gameplay.

Reception
The game was met with very well reception from critics, also having it #3 on Chiban's "Best Games to Play When You're Bored" list, aside from Hyper Amy 32 and Ryau the Jellyfish 5.