I had a handful of great ways for the opening battle of a space opera to go down, but they got totally scrapped when I changed how quickly jumping between star systems worked, and now intra-system travel works. What sort of tactics would the hive mind aliens employ?
The planetary system is mostly small planets orbiting a dim yellow star. The second planet is inhabited by a fledgling colony, with a partial space station and some communication satellites. This planet is roughly the size of earth, but the remaining planets are much smaller (with the smallest being the size of mercury, and some of the larger almost approaching earth sized). There are three "jump points" located at the edge of the system (around 4 light hours from the star). These jump points are approximately equidistant from each other (or close enough that it can be hand waved). One of these is where the aliens have jumped in from, and another is where a reinforcing human fleet will be jumping in from eventually.
Both races have the ability to utilize jump points. Jump points are weak points in space that can be used to generate a kind of worm hole that leads to another star system. Speed through these jumps is variable, meaning smaller ships, that normally would travel faster through them, can slow down to arrive with larger ships that are slower. Time between stars is variable, but tends to be in the 20m-3hour range, depending on speed of the ship.
Both races have some form of intra-system faster than light travel. The humans refer to it as a Slipstream, a bubble projected around the ship that alters the physical characteristics of space, allowing for rapid acceleration/deceleration and faster top speeds. I've not set hard numbers, but one section has the frigate in system capable of travelling an average of 5x lightspeed, including acceleration/deceleration. This mode of travel is dangerous if disrupted, so it is not used in combat (basically disrupting the Slipstream results in a critical existence failure as real space physics take notice).
Humans have FTL communication and FTL sensors of an extremely low quality. They can, for example, detect weapons discharges and detect where a ship is in space, but cannot get visuals or any fine detail until light comes in at the normal speed. One ship can relay visuals to other ships in realtime, though.
Humans can communicate through jump points via relay buoys positioned at the jump points. Failure of these buoys destroys this ability, and buoys must be present at both ends.
Humans have energy shields to protect most of their ships. These shields are effective against most weapons and debris.
Humans use artillery or railguns to launch shells into space. The shells then fire off a small booster that further accelerates them to combat speeds and provides some maneuverability. These shells have a variety of payloads (with "space napalm" and shrapnel being popular choices)
Humans are physically identical to earth humans.
The aliens are insectoid and have a mild hive mind that extends over a range of around 2km. Think of this like a distributed computing network. The more there are the smarter they are collectively, and the faster their thought process and reaction time. This is caused by a mild latent psychic field, and does not impact other races. Each individual is capable of independent action, though many follow the collective will of the hive.
The aliens utilize energy weapons of an unspecified type (fell free to go wild with this). They have a relatively short effective range, but are very powerful.
The aliens do not utilize shield technology, but their hulls are heavily armored. This makes them slower.
A Human frigate (30m height x 210m length x 60m width) was orbitting the habitted planet when an alien destroyer (40m x 260m x 80m) jumped in, destroying an engineering vessel at the jump point. The frigate enterred a Slipstream to engage, when two alien light cruisers jumped in (50m x 320m x 90m). Dropping back into realspace, the frigate reversed course and slipstreamed back to the planet, calling for reinforcements.
Human reinforcements will arrive at their jump point in around 45 minutes.
Aliens have made no move further into the system, and are at their jump point. For these vessels, it would take around 15m to get into combat range of the planet or the frigate.
The human frigate's mission is to defend the colony at all cost (but they'd obviously like to survive).
The alien's mission is to gather information about the human fighting capability, and wipe out everything in this system, including the comm buoy.
The aliens are aware of the possibility of human reinforcements. There are no alien reinforcements available.
Human reinforcements are a full defense fleet, so a battleship, multiple heavy cruisers and lots of escorts. If this fleet arrives, the aliens will need to flee or be wiped out
In system, humans have this frigate, and a handful of cheap fightercraft that won't do much.
The aliens have encountered a few human vessels, and are aware of the fact they have shields. They are not aware of the human reinforcements, or which jump point any reinforcements will come from.
In case it wasn't clear above, the aliens do not have FTL sensors in any way. They are entirely reliant on the speed of light for their sensor data. They also do not have FTL communication
Alien motivations are decimation. They see this system (and perhaps others) as theirs and they will cleanse it of human presence, with a later goal being colonization.
In terms of relative strength, assume that, per normal naval nomenclature, a frigate is a small, fast, lightly armed ship, and each heavier step of ships gets better armed and slower.
What tactics would the aliens use?