Marimo-VS-IAS: Cute Marimo Battle Alien Invaders in Side-Scrolling Shooter

9/10/2026, 1:50:10 PM

Release date: 1/31/2022

Tags: #shooter #casual #side-scroller #shoot-'em-up #action #score-attack #2.5d #nature

User Reviews

Score: 100%4 user reviews
Review Count: 4 reviews
Fetched At: 9/10/2026, 1:50:10 PM

Reference prices

Japan

¥ 980 (JPY)

Steam JP

$8.99 (USD)

Steam Global

Live Store Snapshot

Body text may reflect the state at publication time. For the latest sale, price, and review changes, prioritize the live price panel, review panel, and the Steam store listing.

Japan Price: ¥ 980
Global Price: $8.99
Price in Your Region: ¥ 980Prices as Steam lists them per country. What you are actually charged depends on your Steam account settings.Regional prices checked: 19 Sept 2026
Sale Status: Regular pricing
Price Checked At: 9/17/2026, 12:38:31 PM

The price snapshot and review snapshot differ by about 167 hours. Because they are not always refreshed at the same time, confirm the latest Steam listing before making a purchase decision.

Key highlight

Marimo-VS-IAS is a 2.5D side-scrolling shooter where cute marimo battle alien invaders. It features simple controls, lock-on and piercing charge shots, and a combo-based scoring system for high-score challenges.

Who this is for

A delightful shooter that balances a cute appearance with exhilarating action. While easy to pick up and play with simple controls, aiming for high scores requires strategic depth. Recommended for those seeking a fun and engaging title.

Details

Overview

Marimo-VS-IAS is a charming yet action-packed 2.5D side-scrolling shooter developed and published by JoyPlot.

Players take control of adorable marimo, a type of algae, as they defend their home from waves of invading alien species. This title blends classic shoot 'em up mechanics with a unique strategic depth, offering a fresh take on the genre.

The core gameplay revolves around engaging alien swarms with a simple yet effective control scheme. With just movement and two action buttons, players can unleash lock-on shots capable of tracking up to six enemies simultaneously.

For more intense situations, powerful charge shots can pierce through both foes and their projectiles, clearing out dense formations.

Achieving high scores is a key element, driven by an exhilarating combo system. Chaining together multi-enemy takedowns rewards players, emphasizing the importance of strategic targeting and efficient combat.

The game's 2.5D presentation adds a layer of visual depth to the fast-paced action.

Highlights

Developed and published by JoyPlot, Marimo-VS-IAS offers a unique 2.5D side-scrolling shooter experience.
Features include simple controls (move + two buttons), lock-on shots for multiple targets, and piercing charge shots.
A combo-based scoring system encourages chaining multi-enemy takedowns for high scores, emphasizing strategy and target priority.

Who It's For

Marimo-VS-IAS is perfect for players who enjoy casual yet engaging shooter experiences. Fans of classic side-scrolling action and shoot 'em ups will appreciate the familiar mechanics, while the combo system and strategic depth offer a challenge for score-attack enthusiasts.

Its cute aesthetic also makes it accessible to a broader audience looking for a fun and unique action game.