Recent reviews by glub♥Linux

✔ Good presentation and graphics
✔ Good game mechanics (tower defense done right)
✔ Good sound design
✔ Native Linux support

✔ Interesting game mechanics, easy to pick up and slightly addictive
✔ Procedurally-generated levels, very good level design
✔ Nice graphics, lighting and models
✔ Good soundtracks and sound design which add a lot to the atmospheric scenery
✔ Cute yet grim model design
✔ Easy to read and well presented map of each level
✔ Lots of loot everywhere, easy crafting mechanics
✔ Native Linux support!
✘ Inconsistent frame-rate, ranges from 60 to 30fps but it's not too bad

Similar to Teleglitch in many ways, but with zombies and various monsters, and some neat stealth mechanics.
There is a lot to like about this very polished game.
Controls work great with keyboard & mouse or gamepad.
Yet another excellent game made by PuppyGames.
Highly recommended.

✔ Intricate game mechanics
✔ Good graphics and animations
✔ Native Linux support!

✔ Professional use of the Source engine.
✔ Danger Zone is a fun mode to play.
✔ Official maps are well designed.
✔ Native Linux support!
✘ OpenGL only, no Vulkan (yet?).
✘ Always the same maps.
✘ Maps disappear after a while for some reason.

The best version of Counter-Strike so far.
However, for almost 20 years now, people keep playing the same maps all the time, despite being lots of custom assets out there.

✔ Nice graphics, atmospheric sceneries
✔ Interesting model design
✔ Intriguing environments
✔ Factions fighting each other randomly
✔ Hijacking bots as a spy in the sky up above is a nice idea
✔ Native Linux support! (Proton works very well too)

✘ Poor performance, very low frame rates sometimes
✘ Some minor glitches remain (pistol sound not in sync...)
✘ Long walks, no way to speed things up (a skiing game mechanic like in Tribes would have been great)
✘ Repetitive and simplistic shooting mechanics
✘ A bit short and empty overall, looting does not feel very gratifying
✘ The plot is a bit too simple without any surprises, no betrayal of factions of any kind

✔ Well rendered sceneries / environments
✘✔ Partial Linux support (needs beta branch with password "abc123stasis")
✘ Unskippable cutscenes and dialogues (ESC key doesn't do anything!)
✘ Bad path finding, resulting in deaths, and unskippable cutscenes again
✘ Mediocre voice acting, terrible dialogue writing
✘ Scenario is below average, very cliché and poorly delivered
✘ Some bugs
✘ Sound volume is way too high and clips all the time, absolutely no settings available in the game
✘ Characters don't scale up and down properly according to perspective in the pre-rendered environments

Clearly a labor of love, done by mostly one person (Christopher Bischoff) which is very impressive by itself, but that's not enough for me to recommend.
Certainly not a bad game, but could have been better. The half-baked Linux build is also a bit of let-down (although functional until the end).

✔ Good graphics and animations
✔ Neat game mechanics
✔ Solid control scheme
✔ Rogue-lite elements
✔ Procedurally generated
✔ Linux support
✘ Slightly sluggish frame rate at times

✔ Runs on GNU/Linux
✘ Completely broken on GNU/Linux, controller input is broken, keyboard input is broken, CPU is churning much more than it needs to.

Until the game is fixed, I do not recommend buying it.

✔ GNU/Linux support
✔ Good soundtracks
✔ A lot of levels and level designer
✔ Good presentation
✔ Good challenge

✔ GNU/Linux support
✘ Repetitive and mediocre music
✘ Clunky control scheme
✘ Combat is very tedious and doesn't feel right
✘ Painful level design, terrible platforming
✘ A lot of questionable design decisions
✘ Needless back-and-forth
✘ Colliding with an ennemy drains hit points
✘ Ennemies respawn every screen, same positions
✘ Dying is very punishing, have to redo everything since last save

Disclaimer: I backed the project during its crowdfunding campaign, so perhaps my expectations where too high.
But this game suffers from a lot of terrible design decisions. It's just not fun. If you're looking for a procedurally generated metroid-vania-like game that is fun to play, buy Dead Cells instead.