CelSector Upgrades and Ammo Capacity Explained
CelSector has no skill tree or upgrade shop. Here is what actually makes you stronger, what capacity means, and how to max it for Filled to the Brim.
Quick answer: CelSector does not have a skill tree, an upgrade bench or a currency shop. You get stronger by finding better guns and by raising your ammo capacity. Capacity is the reserve ceiling shown next to each weapon family, and the Filled to the Brim achievement fires when you max it out.
That is a deliberate design choice, not a missing system. The game wants you to solve rooms with the guns you found and the ammo you saved, not with a stat page. This page explains what progression does exist, so you do not spend the first sector looking for a menu that is not there.
There is no skill tree and no shop. Ammo capacity pickups are the closest thing to a permanent power increase.
Is there an upgrade system in CelSector?
No. There is no skill tree, no perk list, no weapon bench and no shop. The pause menu does not have a stat allocation screen. The things that change your power level are:
- New guns. Later models in a family hit harder or fire faster. The laser pistol is the exception that stays useful because of its pattern.
- Ammo capacity. The reserve ceiling for each family. Raising it lets you carry more spare rounds between supply rooms.
- Route knowledge. Knowing where the shotgun and sniper are is worth more than any stat.
- Outfit state. An intact outfit is a defensive upgrade; a shredded one is a debuff. See the clothing damage page→.
If a guide tells you to "upgrade your damage" or "buy the armour tier", it is describing a different game. CelSector does not have those.
What capacity actually does
Capacity is the maximum reserve ammo you can hold. The HUD shows two numbers: the magazine in the gun and the reserve behind it. Capacity raises the second number.
Why it matters:
- Boss arenas lock behind you, so a bigger reserve is more attempts.
- The final boss's adds drop ammo, but only if you can survive long enough to pick it up.
- A maxed capacity turns a marginal gun into a usable one for a full sector.
Capacity does not change damage, reload speed or fire rate. It only changes how much you can carry.
How to max capacity
Capacity increases are pickups, not menu purchases. You find them in the sectors, usually in side rooms or chests that are easy to skip on a straight run. The reliable way to finish the stat is a cleanup pass with stage select:
- Finish the story run first. You will have the guns and the route knowledge.
- Replay each sector and sweep the side rooms before the main door.
- Check the achievement list after each pass; Filled to the Brim is the confirmation that the last increase is collected.
The secrets and chests guide→ lists the rooms that hide progression pickups, and the 100% checklist→ puts capacity in the right order with clothing and achievements.
The real "upgrade" priority
Since there is no stat page, the upgrade priority is a weapon priority:
| Priority | What to get | Why |
|---|---|---|
| 1 | Laser pistol | Infinite ammo, clears rows of adds |
| 2 | Shotgun | Doorway control and web clearing |
| 3 | Sniper | Boss heads and elites |
| 4 | Capacity pickups | More attempts per boss door |
| 5 | Later rifle model | Sustained damage if you dislike the sniper |
The starter pistol stays in the loadout the whole game. It is not an upgrade target; it is the floor that keeps a bad ammo situation from ending the run.
What not to waste time on
- Farming trash for ammo. Drops are sparse and the pistol is free. Farming is slower than moving.
- Carrying two guns from one family. They share a reserve, so you are not gaining a second ammo pool.
- Hoarding the sniper. Save it for heads, but use it. A sniper with a full reserve at the credits is wasted.
- Replaying a sector before the story run ends. You will re-clear rooms you are about to leave anyway. Finish the run, then clean up.
Capacity and the achievement list
Filled to the Brim is one of the 19 Steam achievements. It is a completion flag, not a skill check: if you sweep the sectors, you will get it. The achievements guide→ lists every flag with its condition, including the ones that require a second run.
FAQ
Does CelSector have skill points? No. There is no skill tree or stat allocation.
Can I buy upgrades? No. There is no shop or currency.
What does capacity max out at? The game does not show a single global number; each family has its own reserve ceiling. The achievement tracks the maximum state, not a specific count.
Do weapon mods exist? No weapon mods. The v1.2 patch added texture and translation mod support for the PC build, which is cosmetic/community content, not gameplay upgrades.
Sources
Official source: CelSector on Steam ↗ · CelSector demo on itch.io ↗ · Steam news and patch notes ↗