Choose Project Castaway
Choose Project Castaway if you want an Action, RPG, and Casual experience. On Steam, it's currently about 39% cheaper on the Steam Store. 1,023 Steam reviews back the pick.
Project Castaway vs Under A New Sun
Project Castaway and Under A New Sun both land in Adventure 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 are Adventure games on Steam. Under A New Sun (2023) is 3 years older than Project Castaway (2026). Under A New Sun scores higher on Steam reviews (76.9% positive) than Project Castaway (68.3% 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 Under A New Sun
Choose Under A New Sun if you want an Indie, Simulation, and Early Access game with Custom Volume Controls, Stereo Sound, and Surround Sound. On Steam, it carries the stronger Steam consensus at 76.9% positive across 182 reviews.
Both Project Castaway and Under A New Sun sit in Adventure on Steam and both list Multi-player, Online Co-op, and Co-op, 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
 Project Castaway |  Under A New Sun | |
|---|---|---|
| Released | 2026 | 2023 |
| Genres | Action, Adventure, RPG, Casual | Indie, Adventure, Simulation, Early Access |
| Platforms | Windows, Linux | Windows |
| Steam Deck | Deck Unsupported | Deck Playable |
| Price | 10.99 USD | 17.99 USD |
| Steam reviews | 68.3% positive (1,023 reviews) | 76.9% positive (182 reviews) |
| Multiplayer | Multi-player, Online Co-op, Co-op | Multi-player, Online Co-op, Co-op |
| Developers | Mardonpol Inc. | New Horizon Games |
Side by side
- Both are Adventure games on Steam.
- Under A New Sun (2023) is 3 years older than Project Castaway (2026).
- Under A New Sun scores higher on Steam reviews (76.9% positive) than Project Castaway (68.3% positive).
- Project Castaway is currently ~39% cheaper on Steam than Under A New Sun (10.99 USD vs. 17.99 USD).
- Both support cooperative play.
- Steam Deck: Project Castaway is Deck Unsupported, Under A New Sun is Deck Playable.
Project Castaway vs Under A New Sun — FAQ
- Which is better, Project Castaway or Under A New Sun?
- On Steam reviews Under A New Sun scores higher (76.9% positive) than Project Castaway (68.3% positive). Both have enough reviews to trust the signal, so for players using reviews alone, Under A New Sun is the safer pick. Genre fit still matters — check the side-by-side table for the categories each game lands in.
- Should I play Project Castaway or Under A New Sun first?
- If you want chronology, Under A New Sun (2023) came out before Project Castaway (2026). 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 Project Castaway and Under A New Sun similar?
- They overlap on Adventure 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.
- Do both Project Castaway and Under A New Sun have co-op?
- Yes — both list a co-op category on Steam. Specifics differ: Project Castaway ships Online Co-op, Co-op; Under A New Sun ships Online Co-op, Co-op.