Deflect / Reflect — Design Codex

What it is. A timed input that flips a projectile’s ownership and heading — the shot that was about to hit you now carries your damage tag back toward whoever fired it. Deflect is a mechanic-parry whose payload is a bullet, not a blade.

Player fantasy / why it’s fun. The screen full of danger becomes a screen full of loaded guns. Every incoming shot is a question with a rhythmic answer, and the answer is offense. You feel calm inside chaos — the pull is turning fear into supply.

The verb

Press deflect inside a short active window as a projectile enters your hit-zone; it reverses heading, changes team, and (usually) gains a speed or damage bonus. No window, no reflect — it’s read-and-time, not hold.

How it feels / why it’s fun

Legibility of danger flips. A telegraphed shot stops being a thing to flee and becomes a thing to catch. See system-telegraphs, pattern-readability.
Rhythm under pressure. Deflect turns genre-bullet-hell density into a metronome — pure pattern-mastery-and-flow.
Ownership as reward. The dopamine is watching your enemy eat their own shot. It closes a pattern-feedback-loops tight loop in one input.

Tuning levers

Lever	What it controls	Sane default
Active window	Frames the input reflects	6–8 frames (~120ms)
Aim mode	Where the reflected shot goes	Auto-lock to nearest hostile
Speed multiplier	Return velocity vs incoming	1.5×
Damage owner	Whose damage the shot carries	Player (full), or shared
Whiff cost	Punish for a missed press	None → small recovery lag
Reflectable set	Which projectiles qualify	Flag per bullet; boss orbs opt-in
Cooldown	Gap between deflects	0 (spammable) → gated

Two ships in the aim mode: auto-lock (accessible, system-accessibility) reads as skill because timing is the challenge; manual angle (deflect on a directional stick) makes placement the skill and rewards system-mastery-curve depth. Pick one and commit — mixing them muddies the read.

Damage ownership — the load-bearing decision

The reflected shot’s team and damage number are the whole design.

Player-owned, full damage → deflect is your primary DPS; enemies exist to feed you. (Boss-rush energy.)
Player-owned, reduced → deflect is a tempo tool, not a win button.
Neutralized (no damage, just gone) → deflect is defense only; keeps it a survival verb, not an economy. See system-resource-loops. State the rule once and telegraph it — an antipattern-input-lie here (looks reflected, deals nothing) rots trust fast; see pattern-fairness-and-trust.

Slots into

Genres: genre-bullet-hell, genre-soulslike, genre-fighting-game, genre-action-adventure, genre-horde-survival, genre-physics-arcade.
Anchors: anchor-cuphead (parry-pink taught a generation to slap projectiles), anchor-nuclear-throne and anchor-vampire-survivors (bullet density that wants an answer), anchor-peggle for the satisfaction of a ricochet.

Twist seams

Deflect but reflected shots multiply (risk-reward) — one deflect splits into three fan-out returns, but the split-shots can also be re-fired by enemies, escalating the board. Greed vs. survival, live. See pattern-risk-reward, system-difficulty-and-dda.
Deflect but only the last shot you dodged is reflectable (constraint) — you can’t reflect anything; you have to dodge a bullet first to arm it, then reflect the memory of it. Couples deflect to mechanic-dodge-roll and makes evasion the setup, not the escape. See pattern-mastery-and-flow.
Deflect but the return is a projectile you don’t control (chaos) — reflected shots home on the nearest anything, including you. Reframes deflect as pattern-emergence you steer by positioning, not aiming.

How it wires to Hayao

Bullets are pooled entities in the scene tree; a deflect flips two fields — a heading vector and a team/owner tag — on the projectile under the input window. Keep the flip a pure state transition so it lands in world.hash().
The timing window reads from a deterministic frame clock, never wall time; the reflect result must be identical for the same input frame on replay. All spawn/spread angles go through the deterministic RNG, never Math.random.
Study projectile spawning, pooling, and collision in the projectile/bullet sandbox lab before wiring reflection; study the input-window read against a telegraph in the relevant timing lab. The reflected shot is view-agnostic — the ricochet flash and hit-spark are cosmetic; the damage and heading are sim.

Fails when…

The window is invisible. No telegraph on the incoming shot and no tell on your active frames → it feels like antipattern-rng-frustration, not skill. Deflect demands system-telegraphs.
Everything is reflectable. If every bullet qualifies with auto-aim and full damage, the optimal play is mash deflect — antipattern-boring-optimal. Gate the reflectable set or the aim.
Reflect trivializes bosses. Full player-owned damage + a boss that only shoots = the fight solves itself; see system-boss-design. Give bosses melee phases or unreflectable attacks.
Ownership is a lie. Visuals say reflected, sim says nothing happened — antipattern-input-lie.
It replaces dodging entirely. If deflect is strictly better than moving, you’ve deleted mechanic-dodge-roll and the spatial game with it. Keep some threats un-deflectable.