Spacesuits in the mud are current quite simple things, but their complexity is going to increase as time goes on. Currently, there are several important things you need to know before making or using spacesuits.

An item with the Spacesuit flag protects only from Airless and Vaccuum rooms. The fact you are safe from being depressurised doesn't mean you have a good supply of air however, and you can still suffocate inside a perfectly functional spacesuit.

An item with the AirSupply flag allows its wearer to breathe underwater an in an airless environment. Thus all spacesuits need an airsupply. By default, airsupplies last for ever, which isn't great. Instead, you should set airsupply.max on the item to limit the amount of breathable air it has. This limit is in seconds, and is depleted whenever there is an unbreathable environment around the wearer. When the air runs out, you suffocate as normal. You can refill and airsupply by purchasing template_refill_1 from a shop, which is a magical item capable of refilling all the airsupplies you hold instantly. It is worth noting that remaining airsupply time on items which can be saved s stored in vardata; this means you can't quit and reconnect to have it refill for free!

Manoevering in zero gravity is very hard. In fact, players simply can't do it at all. They may move around with the aid of handrails (set the Handrails flag on a room with no gravity) or by wearing a jetpack (set the Jetpack flag on a wearable item).