This was billed as an introductory adventure. Nowhere in the PDF does it indicate that is is for low level characters. It is obvious from a reading of the text that it is for a group of low level characters.
The method of handling encounters almost guarantees that there will be three space encounters en route to the planet. Instead of a 1 in 6 chance of there being an encounter, there is a 1 in six chance of no encounter. The odds of the encounter ignoring the players or being friendly combined are 50% or greater. So even if there is an encounter, it does not guarantee a chase or fight. The intent of the designer is to have tension. If one is playing up to the tropes of the genre, this is understandable. However, the GM is free to handle this his or her own way.
Once on the planet, there are two encounters, potentially competition from an NPC party, or natives are the greatest possibility. A natural disaster or a creature encounter are also likely. The use of bumble dogs, or a new creature, the gindo, introduced at the end of the module.
This is a very basic outline of an adventure. With the near guarantee of one or two ship encounters, plus two encounters on the way to the temple, it will stretch out the adventure. If you go by the roll of the dice, and there are no space encounters, and the planet side encounters are neutral or friendly, this could be a quick one maybe two hour one shot.
It is an interesting idea, and has enough meat on it that an experience GM could make an evening of it. If you don’t have a list of natural disasters, you will need to make your own table, as the author only gives a couple of suggestions.
The temple itself is a basic dungeon crawl, and it an interesting twist. The map is he standard square rooms and passages, which server to get the point across. The fonts used for the room numbers are not clear, so that some numbers look like each other. I assume that the rooms and areas are numbered in a clockwise fashion, so it is easy to make sense of it, but it still takes a moment to be sure of this. There are also a few grammatical errors, indicating that the text needed a quick review by a new set of eyes or to sit for a few days before finalizing. A suggested description of the natives of the planet, if not a new race, would be interesting.
At one dollar, the items, tables, new creature, and other ideas presented can make an interesting one-shot introduction of the rules to new players, and a skilled GM can easily expand it to be something more substantial in their own campaign.
If you need some help for prepping last minute, this module only needs a few things to be ready to play on short notice.