Until the First Train – Overtime Survival (첫차까지)

A survivors-like browser game about pulling an all-nighter at the office. Clock in at 6 PM and survive until the first train home at 6 AM. Attacks are automatic — you just move and dodge (Space). - Promotions & unlocks: survive until 11 PM to get promoted. 10 ranks from intern to CEO, each unlocking a new starting weapon, ultimate, or perk. - 11 weapon evolutions: max a weapon and its paired passive to level 5 to get an evolution card. - Bosses & the late night: bosses from the team leader at 7:30 PM to the CEO at midnight, zombie bosses return after 1 AM, and the chairman shows up at 5 AM. - Salary & permanent upgrades between runs, plus late-game "overtime training" and "reassignment" systems. - 9 BGM tracks, sound effects, and cross-device save sync. Free, no install or sign-up — plays in a desktop browser with the keyboard. A run takes about 30 minutes and can be paused. UI is in Korean. Made entirely with Claude (Opus 5.5); balance was tuned by having bots auto-play hundreds of runs. AI tool: Claude (Opus 5.5). Engine: pure JavaScript + HTML5 Canvas (no framework).