You may want to:
1. Recolor the ground into more of a grayish color if you want it to be more like a dungeon.
2. Make the enemies unable to stand on each other by pushing them off eachother or something like that.
3. Get some actual screenshots that represent the game.
4. Scale up the view size.
5. Record your own sound effects as using someone elses sounds doesnt looks very good, you may use sfxr to make placeholder sounds for now.
As it says it is the minimum viable product, it haves the basics needed to build upon. The end.