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Inspired by the literature of Arthur C. Clarke and the 2D Exploration Platformers of the 90's and the 2010's, SENTINEL is a 2D exploration-based platformer that takes place in an alternate future. When a mysterious pyramid structure was discovered during the 1969 moon landing, humanity began focusing less on our planet and more on the stars. After years of research, humanity finally discovered a way to enter the strange monolith, but there was a catch: every person who entered never came back out. With volunteers dwindling, a bounty was raised to entice new explorers: $150 billion to the first person who can successfully enter and exit the pyramid.


In SENTINEL, you assume the role of a nameless bounty hunter. Your goal is to explore every inch of the level and try to learn what this strange pyramid really is. The game is played in one large level that features 13 unique rooms for you to explore on your journey. while this task seems tough, you'll be well equipped for your journey in your Nanite Suit.


With the Nanite Suit, you'll be able to navigate the terrain of this unexplored labyrinth, and you'll be able to fight back against the many strange foes that await you. This game features five unique enemy types found across the map, and two boss encounters to really test your skill.


As you explore, you'll find new upgrades for your Nanite Suit that change the way the game is played. Whether it's vaulting off of enemies or blasting through the sky, you'll keep adding tools to your arsenal as you progress. Each ability you unlock allows you to explore, fight, and move in new ways.

Nobody knows what's in this thing. Nobody alive anyways. Maybe it's time you changed that. Good luck!

SENTINEL is a playable concept piece, and thus is fairly short (Like, less than an hour short). While we currently aren't actively developing more levels for the game, we will continue to make bug fix and quality updates to this version of the game. If you'd like to show your support for the game, report a bug, make a suggestion, or just chat with the developers, please join the discord server linked on this Steam page!
Release date
Matthew Brown
Jack Perkins
Kriscia Martinez
Matthew Brown, Vania Games
Age rating
Not rated

System requirements for PC

  • OS: Windows 10
  • Processor: Any from the last 10 years
  • Graphics: Any from the last 10 years
  • Additional Notes: You can probably run this lol.

System requirements for Linux

  • OS: Ubuntu 10.04 or later
  • Processor: 2.0Ghz+
  • Memory: 2 GB RAM
  • Graphics: Shader Model 2.0+
  • Storage: 750 MB available space
  • Additional Notes: Widescreen monitor required.

System requirements for macOS

  • OS: OSX 10.5 or later
  • Processor: 2.0Ghz+
  • Memory: 2 GB RAM
  • Graphics: Shader Model 2.0+
  • Storage: 750 MB available space
  • Additional Notes: Widescreen monitor required.
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Last Modified: Jan 30, 2023

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View all videos
1,000,000 items
Remove the virus from the system.
Gate 5
Hack the final gate.
Gate 4
Hack the fourth gate.
Gate 3
Hack the third gate.
Gate 2
Hack the second gate.
view all achievements
7 items

Sentinel reviews and comments

Translated by
Microsoft from Deutsch
Small TD game with weak Graphics and too much Micro Management. I took the Game because I:-TD games like-the Reviews were overwhelmingly positive-it was cheap to buy at the Christmas auction-coming from Hexcells developer Matthew Brown-was curious as an Interactive Audio Tower Defense is Pleasing:-the Music E I am fooled because:-the Graphics are too easy for me for a TD game-the Maps are too small-the Main Challenge is to shift the energy for the Towers back and forth as quickly as possible (Micro Management for each individual Tower) That's why the Thumb tilts into my m Verdict down, even if I've already seen worse TD games. More Recommendations for Tower Defense Games: http://store.steampowered.com/curator/8896126-Gametests-and-Videos
Translated by
Microsoft from French
This is a nice idea: a Tower Defence where the soundtrack (electro) changes according to the power attributed to each of the towers. It makes a little sense to be a DJ:). The game works perfectly (under Arch Linux 64 bit, xfce, core i3, GTX 660) and has a tutorial that explains well what to do. However, I'm not a fan of having to constantly increase or decrease the power of the towers, depending on the enemies arriving on each of the two lanes leading to the central base to protect. This game is more of an action game than a classic Tower Defence. Also the nightclub type animations in the background are a bit ' too much ' and an option to decrease their intensity would be welcome. If the idea of the game pleases you then you can buy it safely, but personally I do not think to play it much.
Translated by
Microsoft from Russian
Middle TD with elements of the development and distribution of resources. Minimalistic from the graphic side. Requires attention and brains. Pros: Good design. Varied musical accompaniment. Of The minuses can say only one thing-background support, which is too imposed. Though How to know if it wasn't for him-perhaps it would be boring. About the gameplay: And So, all that you are given: a Stripe (the path of viruses) access Point (which you want to protect) And anti-viruses (towers), which, by the way, do not shoot, until you give them a couple of "energy cubes (which incidentally is not enough)." Everything would be nothing, but if you stick to each turret on such a cube-long do not stretch, have to prioritize at the moment, and charge certain towers. The cubes are Distributed by rotating the wheel of the mouse (which is not convenient for me-the wheel clogged) Development consists in collecting "Luta" from the killed viruses-which gives an opportunity to learn new ways of protection.
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