Welcome to Hell is mainly worth checking through block placement, pickup, upgrade, and repair, traps, power, doors, and devices, base persistence and multiplayer permissions, trader stock, prices, and refresh timing, quests, rewards, and map markers, and join path, client files, and server files. Do that in a copied save or test server before changing a main world.
Use Nexus Mods listing for exact file names, branches, screenshots, and update notes, then confirm the in-game behavior listed above still works after a restart.
- Place the blocks in a copied base, upgrade them, damage them, repair them, and restart.
- Run the powered or interactive part through a blood-moon-style stress test if relevant.
- Have another player interact with the block before adding it to a shared base.
- Check several trader days before deciding the economy is balanced.