The medals ''Killing Machine'' and ''Bloody Fun'' have problems cause i beat the game and obviously i have already killed more than 100 enemies and ''bloody fun'' says ''use 3 blood heals in a single wave or boss fight'' i have done it in both and nothing happens.
In endless mode there are no bosses, ''Endless Mode has now been increased in difficulty. Bosses will come in every 5 minutes or so. Keep a look out because enemies will also continue to creep in while bosses are on the stage!'' nothing happens i played 31:49 mins in endless mode and no bosses appeared so i think you might have to check again on the fix you said you did.
good game very simple yet addictive and fun but just 8 levels its too short. 5/5 9/10 nice game.
PS: sorry if you cant understand my english im still practicing.