Choose Ion Assault
Choose Ion Assault if you want a Casual game with Steam Leaderboards. On Steam, it's a focused single-player run rather than a multiplayer commitment. Ion Assault launched in 2010.
Ion Assault vs Really Big Sky
Ion Assault and Really Big Sky both land in Action, Indie on Steam, which is why they keep getting compared. The comparison below is built from each game's Steam metadata — release year, genres, categories, Steam Deck status, price, and review score — refreshed daily by imho.run's scraper. Headline differences: Both share Action, Indie on Steam. Ion Assault (2010) is 2 years older than Really Big Sky (2012). Ion Assault scores higher on Steam reviews (75.9% positive) than Really Big Sky (69.5% positive). No login or purchase needed — scroll for the full table, the verdict FAQ, and links to ranked similar games for both titles.
Which should you pick?
Choose Really Big Sky
Choose Really Big Sky if you want the Multi-player and Shared/Split Screen side of the pairing. On Steam, it's currently about 50% cheaper on the Steam Store. Really Big Sky launched in 2012.
Both Ion Assault and Really Big Sky sit in Action and Indie on Steam, so either pick lands in the same broad neighborhood. Use the side-by-side table for the feature view, or follow the "Games like" links below to see ranked alternatives for either title.
Side-by-side comparison
 Ion Assault |  Really Big Sky | |
|---|---|---|
| Released | 2010 | 2012 |
| Genres | Action, Indie, Casual | Action, Indie |
| Platforms | Windows | Windows |
| Steam Deck | Unrated | Deck Unsupported |
| Price | 9.99 USD | 4.99 USD |
| Steam reviews | 75.9% positive (54 reviews) | 69.5% positive (151 reviews) |
| Multiplayer | Single-player only | Multi-player |
| Developers | Coreplay | Boss Baddie |
Side by side
- Both share Action, Indie on Steam.
- Ion Assault (2010) is 2 years older than Really Big Sky (2012).
- Ion Assault scores higher on Steam reviews (75.9% positive) than Really Big Sky (69.5% positive).
- Really Big Sky is currently ~50% cheaper on Steam than Ion Assault (4.99 USD vs. 9.99 USD).
- Really Big Sky is Deck Unsupported on Steam Deck; Ion Assault has no Deck rating yet.
Ion Assault vs Really Big Sky — FAQ
- Should I play Ion Assault or Really Big Sky first?
- If you want chronology, Ion Assault (2010) came out before Really Big Sky (2012). If neither is a sequel to the other, order doesn't really matter — start with whichever fits your current mood, since both share enough on Steam to make either a reasonable opener.
- Are Ion Assault and Really Big Sky similar?
- They overlap on Action, Indie on Steam, so the catalogue groups them together — but "similar" depends on the specific mechanics. Use the genre + category rows above to decide whether the overlap matches what drew you to the one you've already played.
- Does Ion Assault have multiplayer like Really Big Sky?
- No. Really Big Sky supports multiplayer on Steam (Multi-player), while Ion Assault is listed as single-player only.