Picking an Engine You'll Actually Finish With
For mobile, the engine choice matters less for raw power and more for how well it fits your team size and the platforms you're targeting. Unity remains the default for a reason: strong 2D and 3D tooling, a huge asset store, and enough documentation that you're rarely stuck without an answer. Unreal Engine can produce more visually ambitious results, but its build sizes and performance overhead make it a harder sell for most mobile projects unless you specifically need that fidelity. If you're a solo dev or a two-person team, the engine with the gentler learning curve usually wins, because the fastest engine is the one you don't abandon halfway through.
Performance Budgets Aren't Optional on Mobile
Desktop and console give you some room to be sloppy with performance early on. Mobile doesn't. Thermal throttling, wildly inconsistent GPUs across Android devices, and battery drain all punish a game that wasn't built with a performance budget in mind from the start. Profile early, even on a rough prototype, so you catch a frame-rate problem while it's still one system's fault and not the accumulated weight of six months of features built on top of it.
Version Control Isn't Just for Teams of More Than One
Even solo devs benefit from Git, or a similar system, from day one. Mobile projects tend to accumulate large binary assets fast: textures, audio, build artifacts. Untangling a messy history after the fact is far more painful than setting up a sane .gitignore before your first commit.
Testing Across Devices You Don't Own
This is where mobile development gets genuinely harder than PC: you can't own every phone your players will use. Emulators and device farms help, but they don't fully replace testing on real, aging hardware, the three-year-old mid-range Android phone that thermal-throttles by minute five, the iPhone with a battery that reports full charge but sags under load. Budget time for this specifically. A bug that never shows up in the editor can be the first thing a real player hits.
Getting Ready to Ship
Before launch, the checklist gets less exciting and more important: performance passes, crash reports from a beta group, and making sure the build behaves the same on low-end devices as it does on the one you developed on. None of this is glamorous, but it's the difference between a launch that goes smoothly and one that gets buried under one-star reviews about crashes within the first hour.
If device testing is the part of this list you keep putting off, that's a common gap for solo and small teams, and it's exactly what IndieBug covers: structured playtesting and bug reports before your mobile game goes live. See our plans if you'd rather have someone else stress-test the build.