Recent reviews by Bugman X

It's a blast! Not complicated, but captures the feeling of might of a Space Marine. I'd like it better if there were more RPG elements though.

Super addictive, sometimes mindless, but pretty well-balanced and thoughtfully designed, with good depth / unlocks.

Very very *fun*. Class dynamics keep you dancing on the edge between survival, killing, and grabbing items to buff yourself, as enemies get stronger with the passage of time. There are a good number of unlocks and many challenging achievements. It's not terribly deep otherwise (cycle through a handful of levels, if you die you have to start over) but I've spent many hours on it as the replay value is enormous. Multiplayer is a must.

And yes, it is HARD at times.

Unfortunately, the last update broke it for me on WINE, and many Windows users have reported issues as well (see /r/riskofrain.)

All in all, I recommend it, but I really hope they land the long-promised Linux release and some bugfixes soon.