This is a great example of the risk you take when you buy indie games. Don't worry, the game is completely functional (as far as I know).
RS:TFR (does an acronym go within another acronym?) was one of the relatively few games I voted for on Greenlight. It looked really interesting and I was excited for it to possibly be released. And then it was Greenlit, and came out soon after! Neat! However, it seemed rather bare-bones. It didn't have controller support. It didn't have a lot of enemies. The classes weren't balanced. The game didn't even seem balanced! Surely they'd add more classes, enemies, controller support, weapons, etc. later on, right?
They didn't, and they won't. The game has had technical patches, so it works. It's just not as much as I expected it to be, going in.
As for the game itself, it plays like Duke 3D in that you're only allowed to look left and right, not up or down. The levels are randomly generated hallways (with scenery and a theme). Enemies are two-dimensional. Walls are two-dimensional. The creatures and weapons are creative, both in design and strategy. It is a true roguelike in which you go through floor and floor until you reach the 100th (which I haven't achieved). Intel, a rare drop from any enemy, accumulates to unlock more classes, more perks, and more monster bios, which detail their strengths and weaknesses.
I'm not so thrilled about everything being two-dimensional and being locked into horizontal aiming. Sure, it's "old-school," but it's not really fun today. Controller support would be great for this title, but I guess it's just too much for the devs to implement. Also, the game was made to run at a much smaller resolution than 1920x1080 and just won't look well if you stretch it out. You can see this with the screenshots - your Steam screenshots end up as a tiny screenshot in the upper left corner of a black canvas. Also, well, you can see it in the art assets. Two-dimensional and low-res.
The game is fun, but it needs more love from the devs in terms of controller support, content, and maybe better resolution options. Since they're indie, I doubt this game will ever see another update - they've moved on. A good price to pay for this title would be $5.