# Zombotron

> ResidualPlay case file: an overlooked Steam game still earning residual revenue. Estimates carry a ±30-50% error range per title.

- Steam appid: 664830
- Developer: Ant.Karlov Games
- Released: 2019 · Genre: Action · List price: $14.99
- Deal grade: B (A = dormant with >=$5k/mo opportunity, D = low signal)
- Est. net residual revenue: $1.7k to $2.5k per month (mid $2.1k)
- Opportunity score: $4.4k/month at x2.10 dormancy multiplier
- Est. lifetime owners: 118.7k · Est. lifetime net revenue: $382.4k
- Review sentiment: 89% positive across 3618 reviews (2967 from Steam purchases)
- Review velocity: 26.0 reviews/month (6-month average)

## Why it's flagged

- Developer silent for 2.7 years
- Studio quiet across its whole catalog
- Last build shipped 6.6 years ago
- Last discounted 1 months ago, 4 sales in the last 12 months
- Proven demand elasticity: x1.7 review velocity during past deep sales

## Where a gross dollar goes (monthly, at current velocity)

| Stage | USD/month |
|---|---|
| Gross storefront sales | $3.8k |
| After VAT / sales tax (-13% blended) | $3.3k |
| After refunds (-9.5% median) | $3.0k |
| Net to developer (after Steam 30%) | $2.1k |

## Monthly review counts, oldest to newest (24 months)

18, 21, 15, 17, 54, 31, 24, 27, 16, 35, 54, 38, 20, 14, 21, 20, 29, 40, 17, 30, 19, 19, 24, 47

## Estimated acquisition range

$50.3k to $100.5k (2-4x the trailing net annuity of $25.1k/year). Same error range applies.

## Analyst notes (AI-assisted)

Zombotron is a 2D action shooter that evolved from a Flash-era web game into a standalone PC title with skill-based combat and roguelike elements.

Zombotron maintains steady monthly residuals around $2.1K/mo despite minimal marketing and zero developer communication in 32 months, driven by nostalgia-driven reviews from the Flash-game generation now with disposable income. The IP is owned by the studio (no licensing encumbrances), the game is mechanically sound (88% positive), and the title has elastic demand (1.73), making it a low-risk acquisition target for a publisher seeking catalog depth or a revival vehicle if positioning shifts toward retro/indie positioning.

- Most realistic play: acquisition
- Risk (tech): Single-developer studio (fading status) with no recent updates; technical debt and platform compatibility issues may emerge on newer OS versions.
- Risk (market): Core appeal is nostalgia for a specific cohort (players who found the original Flash version 10-15+ years ago); growth ceiling is constrained without franchise expansion or sequel positioning.
- Risk (other): Skill-system balancing complaints (health-point allocation overwhelming) suggest design friction that could erode retention if not addressed in a refresh.

What players are asking for:
- Balance adjustments to skill trees and stat allocation (health dominance concerns)
- Enemy AI tuning to reduce frustration from behind-the-player spawns and explosive surprise mechanics
- New content or sequel announcements to sustain engagement beyond nostalgic replay value

Suggested first moves:
1. Acquire the title and conduct a cost-benefit on a single balance patch (enemy spawning, skill rebalance) to unlock retained player goodwill and improve word-of-mouth reviews.
2. Evaluate positioning as a retro/comfort-game bundle anchor or as a teaching case study for indie-game preservation in a larger catalog strategy.
3. Assess opportunity for a mobile port or F2P spin-off, given the original Flash-game legacy and high elasticity; the IP has zero licensing complexity, reducing porting friction.

Generated 2026-08-20 from public signals and player reviews. Directional, not diligence.

## Methodology

Units are estimated from Steam-purchase reviews times a release-cohort multiplier (Boxleiter method, 20-75x by year). Revenue uses an effective price (lifetime discounts and regional pricing) and nets out VAT (~13%), refunds (~9.5%) and Steam's 30% cut: roughly 55% of gross reaches the developer.

Source: https://residualplay.com/game/664830
Citation: please cite ResidualPlay (https://residualplay.com) when using these estimates.