If you didn't think there was enough "Gauntlet" in "Gauntlet", you should probably invest in this. I will mention Gauntlet rather a lot in this "review", btw.
The first point, and it's a reasonably large one, that this game scores over Gauntlet is that it has genuinely random (thus replayable ad inifinitum*) levels and a fairly expansive character customization section make this a far more worthwhile purchase. Gauntlet promised randomised, limitless levels and failed to deliver, preferring instead to rotate a level through 180degrees or make you do them "the opposite way round" (from start to finish in a 'death' level, for example). It's obvious, woeful and does nothing to hide the fact that you're always playing from a small group of levels that can easily be remembered, no matter what way round they are.
There are also more "world types" than in Gauntlet.
The player upgrade system is somewhat similar but, again, full mojo rampage has a better one. There's more to spend your ingame currency on and the prices of everything gets quite high so you need to take time to find cash. This isn't annoying, however. Also, found items can be sold in the shops ingame, which produces a lot of extra cash. Item drops are random and there are a LOT of different items that you can find. You can also mix together 2 items to get a single item with all the effects of the 2 individual ones. This is a fun way to make interesting "charms" to equip and also an interesting way to cause a sort of "inventory game" to arise, wherein the player must decide what stuff to keep/dump in favour of potentially more useful items. You can also expand your inventory, too, so it's possible to carry more. I liked this aspect of the game as, again, it adds another random dimension to things that makes each playthrough different.
I've put a fair amount of time into the game and I still find it fun to go back and play more. Also, I have yet to complete all of the levels on "hardcore" difficulty, which requires a more levelled up character. I think, beyond that, there's "nightmare" or "insane", something like that, so there's plenty of reason to return and play more*. I will be trying to finish all the levels at all skills and will probably wind up doing so at some point. I see this definitely as a game I can return to in future as I've enjoyed it and it does a lot of things that I, personally, like in games.
Some people have said this is tough but I think it's reasonably easy, it's far easier to solo than Gauntlet, for example, which is easy enough but you have to adhere to a plan/play style to get through. You have much more option to just "muck around" in full mojo rampage, as a result of the levels being more open and monsters spawning/wandering randomly instead of coming from "summoning stones" in closed rooms (another bad point about the new version of gauntlet).
Finally, it's not really a roguelike, tbh. There's a lot of games called Roguelikes these days but I would say this has much more in common with something like Gauntlet or Alien Syndrome. Neither of which are roguelikes. Unless you count Gauntlet 4. People seldom do, despite it being by far the best version (genesis cart, have a look if you like Gauntlet). HOWEVER, I did play one game where I was transported to a random dungeon that was made of ascii and I had to fight various "G" and "M" symbols. This was excellent and I would probably play the whole game in this manner if the option existed. There are some nice little diversions like this in the game. As I've mentioned, you're never quite sure what's going to pop up and, for this reason and the others above, I rate this as a really good and fun game.
The online works well, too.
*If you enjoy the premise and play style of the game, of course.