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A short active incremental game where you stack ludicrous weapons and upgrades onto a tower. Destroy a gigantic evolving horde, unlock new tech, repeat.
Price history tracked since Jul 7, 2026 · vs all tracked offers.
Based solely on tracked price history — not purchase advice.
Tracked since Jul 7, 2026.
Steam Train Fest starts Jul 20, 2026
Official stores with direct support.
//Select a level, and aim your tower's artillery towards incoming enemies. BOOM! Grab any precious resources the enemies drop.
//The tower will inevitably fall. Under your command, it will rise even stronger. Fortify your tower with weapons and upgrades.
//Research new and increasingly powerful tech.
//Defend the Bastion until the end. You and your weapons research program are the last line of defense against the machine army. There's no telling if this reckless operation will allow Humanity to survive. What will happen when the horde becomes insurmountable?
Lowest tracked price: PLN 11.90 (Jul 7, 2026) · current best: PLN 14.88.
95% positive reviews in the last 30 days (98% all-time) · 8 peak players in the last 30 days.
Right now the cheapest offer for BastionOS is PLN 14.88 at Steam. KingsPrice compares 1 offers from 1 stores — official stores and keyshops — and refreshes prices throughout the day.
The lowest price KingsPrice has tracked for BastionOS is PLN 11.90 (recorded on Jul 7, 2026). This covers the stores and period we monitor — set a price alert to catch the next drop to that level.
BastionOS peaked at 8 concurrent players on Steam in the last 30 days (highest on Jul 9, 2026). The player chart on this page updates daily.
Create a free price alert on this page and KingsPrice will email you when BastionOS drops below your chosen price. The biggest discounts usually appear during seasonal Steam sales and publisher promotions — the sale calendar on this page shows the next confirmed event.
