Pretty good game, emulating the Mortal Komabt franchise.
Not many problems here, graphics are pretty good at copying the old school Mortal Kombat graphics and the controls were fully functional. All in all the game was thoroughly enjoyable.
Rhea was difficult to beat at first until I found the right strategy. It was pretty brief though, that's probably the biggest problem for me. I think Rhea's difficulty was set perfectly that beating him got a little bit frustrating.
If you're having difficulty beating Rhea, I'll give you a clue, Rhea is a lot like Shao Kahn when it comes to the approach you have to take when trying to beat him!
Hope I helped!