TLDR: Very fun game even though I usually don't like turn based games. If you enjoy old school turn based games or old school RPGs, definitely give this game a try. Has good build diversity, giant map, cool quests and loot, and challenging but not too unfair enemies.

Just finished the main campaign and I can say I enjoyed it a fair bit. The story was quite cool with events I definitely did not foresee happening. Even the side quests had their own mini story most of the time that gave me much more time to spend in the world or just enjoying the game. One of the first side quests I did was apparently a story side quest that you might not even find because it relies on your save having a randomly generated location spawn in which I thought was cool (might be wrong about that, that's just what the wiki said).

The sound design and music is also quite good. When I'm exploring an abandoned part of the metro, wandering through dark corridors, throwing flares to light my way and hearing skittering in the dark with ominous music playing, it actually made me uneasy because I was not sure if the skittering was actually part of background noise or if it was the dreaded death stalkers waiting for me to open a door.

The combat is your run of the mill old-school turn based game, movement points and action points, consumables, blah blah blah. Nothing to write home about, but it was the variety of weapons that I saw and tactics I had to employ to defeat different types of enemies that made it enjoyable. Setting minefields and bear trap chokepoints, stealthing through and killing alone targets, using my stunning throwing knives on the right target. All of that made it for quite an invigorating experience.

I remember watching a video where if I remember correctly they called Underrail the epitome of save scumming, which I now agree with because I was saving and reloading multiple times for a single fight (was playing on hard difficulty not dominating because I don't usually play turn based games in the first place). It also depends on your build I want to say because I was playing a low health, but fast and hard hitting knife character, so a couple unlucky crits the enemy lands means pretty much instant death. Most enemies have at least one weakness, so my earlier hours I spent most of my time probing enemies for their weaknesses, like when I first encountered burrowers I thought they were ridiculous, until I started experimenting and found that electricity melts them like butter.

The build variety is also pretty amazing, I am a guy who loves thinking of and trying out different builds, with having a word document of different Skyrim builds somewhere on my PC. So once I started seeing all the different unique weapons and feats I could get both outside of and inside of leveling, I started getting really into it. I always go for a stealthy melee build first and foremost since that's my main playstyle. However, I now want to try an acid pistol build because I found a specific belt that makes acid pistols sound much better, a shotgun build because I love shotguns and it seems like a blast just sprinting at someone and blasting them in half, and of course a psionics build because I did not even touch psionics my first playthrough.

There were only a couple times where I actually raged or got annoyed with the game to the point of not wanting to play it again. The first time was at the very start, where I thought I was going the right way but actually was not and was dying over and over again. The second was near the end when enemies continuously respawn and blocked my way past a tunnel since it was the only way I could go, and I had to rely on RNG to hope not to be stunned by the time it was my turn so I could run past or kill a couple and escape.

Overall, this game is quite fun. Me being someone who does not enjoy turn based games often because I do not like relying on RNG to win a battle but rather my own skill and precision and whatnot, still found this game a hidden gem. I 100% recommend this game to anyone who enjoys old school turn based and RPG games.