Hmmpf
It's a beat em up, it's supposed to be easy and enjoyable.
1 on 1 fights are hard already, and you pit the player against 4+ enemies at the same time?
Why does the character stall with each hits? It is only annoying when you are surrounded. Enemies do not stall long enough after a hit, either, even if it's a gunshot.
Other than that, it's very well done. This game would be a lot of fun if you allowed the player to basically bust through everything. For example, when you're hit, the character should flash for a moment instead of stopping on the spot. Enemies should be knocked down after a blow so it's possible to take care of groups without running away and aiming a grenade carefully.