If you are a fan of the older style of FPS games like Quake, then this is a game you should definitely look into.
As it advertises, the game is a bit of an FPS roguelite, both the level layouts as well as the enemy patterns are randomly generated. However, you will not be picking up any new weapons during your run. Instead you will choose a gun and a perk (things like triple jump, no fall damage...there are several unlockable ones as well) at the start and level it, also occasionally finding mods for it. At first this seems a bit disappointing, but when you actually see some of the mods out there, you realize you'd be better off just trying to make your favorite gun super powerful. You do have infinite ammo after all, there's no worrying about scavenging for bullets or running out here. (Edit: It appears I was wrong, you *can* find new weapons, they are just ridiculously rare, because they are OP and really fun to use)
Also, yes, you really can have a ridiculous number of jumps just like the store ad says. I've had a run where I can jump 16 times in midair, and had I found more items, I could have maybe went to 20 jumps. The reason you can have so many jumps is because there really is no other way to reach things in some rooms. Don't expect to find everything in any playthrough of Tower of Guns, there are just too many places either hidden behind fake walls or placed insanely high so you can't reach it without a ton of jumps. However, do remember you can rocket jump in this game, so people who are better at it than me can probably find some cool secrets.
The performance is pretty good, game runs smoothly at all times. This is the Unreal Engine though, I expect it to be capable of good performance like that.
Overall, this is a really fun game, and the dev should be proud of himself for making such a fun game considering he did it all by himself. Props to his brother for the OST as well, while it's not something you're going to listen to for hours, it fits the game in my opinion.
(I should also mention I've had this for a few months before the steam release, it was fun even before it was finished, and it's even better now.)