An Ode to Alan Turing · June Solstice Game Jam
Dash through enemies, break the cyphers, decode the city and its Fall!
Play free in your browser, no download: https://lancefall.pages.dev
Summary
- Built solo, from scratch, in 13 days for the jam. 100% vanilla TypeScript, 1,400+ automated tests.
- A real-time dash-combat bullet-hell where your only power is a momentum light-spear but your real weapon is cryptanalysis.
- Every boss is a live cipher you decode. Solve the ciphers mid-fight to defeat them and restore light to a city that was made to forget itself.
How to play
- You don't shoot, you dash. Timing is everything. Wait for the right moment and dash your ship straight through the enemies to cut them down, all while dodging other attacks.
- Bosses are harder, you can't just dash through them. Each one hides behind a cipher. Solve it and the boss breaks open. Crack the final code and Lancefall returns to colour and daylight.
The story
Lancefall was a Star Kingdom lost to darkness, but not left in ruins. The Six who let it fall enciphered it, scrambling its light into grey static so that the loss could not even be remembered. You are its last hope. Descend through the coded history of the Fall, break each boss's cipher, and decrypt the city back to daylight.
The basics
- 6 bosses, 12 enemies
- 6 playable ships, each with its own feel
- 8-level difficulty ladder (Heat) for the score-chasers
- 6 game modes including daily and weekly challenges
- 11 in-run perks to draft, with 7 upgraded "fusion" versions
- Guided tutorial
Key features
-
Decrypting in combat - Each boss is ringed by ciphered symbols (Σ Δ Λ Φ Ψ Ω…). The HUD shows you a word to spell
LIGHT,DAWNand the key to read it by. Dash through the symbols in the right order to spell the word and break the boss open. Nothing is highlighted for you. Finding the right symbol is the puzzle. - Memory Fragments - As you fight through the Fall you collect Memory Fragments. Recover pieces of everything that was lost.
- The Codebreaker - Between runs you build a machine. THE CODEBREAKER. Spend your Memory Fragments to decrypt the transmissions of the Fall, word by word, slowly piecing the kingdom's story back together.
- The Mirrorblade - The ultimate imitation game. A boss that isn't a person, it's your own doubt incarnate, identical to you in every way, moving exactly as you move. Can you even tell yourself apart from a machine?
How it fits the theme
An ode to Alan Turing. One you play, not just read. Turing cracked Nazi codes in WWII and helped invent the computer, so it felt right to build a game where breaking codes is the whole point. His biggest ideas are mechanics here, not lore:
- The Bombe (his code-breaking machine) → the boss cipher-locks and THE CODEBREAKER.
- The imitation game → the Mirrorblade, the boss that plays you back.
- The halting problem → the ending: a choice no computer could make for you — you simply have to decide, yourself.
- Game play → the same for every player, like a machine following precise rules.
Solstice — the longest day. Every fight you win and every code you crack restores a little colour to the grey. Crack the final code and the Star Kingdom breaks into daylight. The sun rises over Lancefall again. The longest day of the year is the day the light finally wins.
How I Built It
This was built from scratch, for the jam — first commit 8 June 2026, 700+ commits over 13 days — and it's a real game engine, not a single HTML file.
- No framework, all crafted. Vanilla TypeScript, Canvas 2D, and the Web Audio API. No pre built game engine, no UI library. A fixed-timestep simulation holds a steady 60 fps, decoupled from one global time-scale so slow-motion and hit-stop layer for free, object pools keep the hot path allocation-free and the dash uses swept collision so even the fastest dash never tunnels through an enemy. All in a single browser tab.
- The whole code-breaking layer is built to draw zero randomness from the game's scoring. It means the daily challenge is identical for every player on earth. Same enemies, same bullets, same cipher. A deterministic machine, provably unchanged. That felt like the right way to honour Turing.
- I made the cipher real, not a quiz. The first version printed the answer as numbers and highlighted the next target You were matching numbers, not breaking a code. I tore it out. Now the symbols sit on the boss, the key sits on the HUD, and nothing is highlighted. You genuinely read, deduce, and decode under fire. A wrong step just fizzles, so it stays cryptanalysis, not a memory test.
- 1,400+ automated tests. The whole simulation is covered, including a test that plays a cipher from start to finish and a guard that runs the daily seed and checks the entire wave-by-wave stream still matches, exactly, so the shared challenge can never silently drift. Every change went through the tests, a type-check, a production build, and an in-browser smoke run before it shipped. This build was a fast, rough sprint. Code structure could be better but all the important components are solid. I will keep working on this game and polish it further.
Demo
Game runs best on desktop. Works on mobile version are still in progress but it is playable.
Code
https://github.com/patij212/lancefall — licensed under the PolyForm Noncommercial License 1.0.0: free to play, read, and learn from for any non-commercial purpose, all commercial rights are reserved by the author (patij212).
Where to play
Play free in your browser — nothing to download: https://lancefall.pages.dev
Credits
Audio. CC-BY beds via Free Stock Music under CC BY 4.0:
- "Magenta Metropolis," "Afterglow Love," and "Cyber Thriller" (the WARDEN boss) — FSM Team & ‹e s c p›
"Cyberpunk Renaissance," "Neon Drive" — Punch Deck
Combat sound effects are CC0 from Kenney.
The LANCE THEME motif and beat layer are original to LANCEFALL by patij212.
For Alan Turing (1912–1954) — who broke the world's hardest ciphers, asked whether a machine could think, and was never allowed his own daylight. This one is played in his honour.
