IMO half of them are very similar but the rest are very different.
This game is less action but more planning/preparation.

In this game, player characters are much stronger combatants than in Hotline Miami:
Always in Slow-mo and many of the enemies are hesitant to attack (approx 1sec in real life time?).
Your characters can sprint 8m to knock out 1 enemy, throw your weapon to another one, then do the same with a left-hand/backpack weapon, and grab a thrown weapon by teleporting.
It is not difficult to beat 4 mundane enemies with 2 mundane weapons.
Or you can dodge a pistol bullet at medium range.

However in this game both players and enemies have very strong sci-fi gadgets.
Elite enemies are practically invincible unless you have appropriate gadgets to nullify them:
Electrical shields, Physical armors, teleporters and sensors to jump into your kissing range or even instant kill.
That is why you need more planning/preparation.

Other than that, very similar game style.
Planning, stealth, brawling, and catharsis.

The only similar things about them is being top-down and killing people. Give it a try

Heat Signature is a stealth/infiltration game about breaking into randomized ships and completing an objective (Such as: Kidnapping an officer, extracting a hostage, assassinations, or stealing a prototype device)

It is heavily focused around pausing and slow motion, as you can teleport any item on the ship into your inventory from pause, and you can freely access your inventory and plan ahead when paused.

Whenever an enemy is aiming at you, the game goes into slow motion, whenever you're aiming the game goes into slow mo.

You get a large number of gadgets like teleporters, hacking devices that subvert or disable devices, tools to remotely clone digital keys to access new sectors of the ship.

All of this builds up to you taking on a high difficulty personal mission to avenge a loved one, or to save someone, or steal something to gain the money to retire your permadeath character and to give out one of their items to permanently be available in the lootpool.

The game is very different from hotline miami and the only similarity is the fact that they are top-down

In my case, the main difference is that I can actually play Heat Signature, while for some reason I could never get Hotline Miami to even start without straight up crashing to desktop...

If I had to compare Heat Signature to another game, it would be "JUSTICE SUCKS : Tactical Vacuum Action". In which you play a sentient roomba. Your human family has been kidnapped, so you go on a rescue mission, but you're roomba. So you have to hide under furnitures, wait for the right moment to strike, "hack" power sockets, lamps and poledancing androids to act as traps against your foes, and of course, vacuum their weapons to use them. Oh, and vacuum their blood and body parts, too, it powers your special abilies...

Not the same game, but kinda the same vibes.