Tisk tisk, I go away for 2 weeks come back and hardly any advances in the game, chop chop, don't keep me waiting too long
*Rant Part*
Blood effect when monster dies shouldn't take more than 1 or 2 minutes coding it then creating textures etc.. 1 or 2 mins...
More enemies, if you've coded the game in the right way it should be no problem to add in more enemies by switching one variable
More things to jump on - depends how many objects, probably be on going until you've created all the levels.
Trees, dungeons / Levels probably 2-5 hours...
Save function(will be imported from "the digger") - takes about 1 minute to code
Intro movie - should be done at the very end, like most games.. can take from 1 second to 5 days depends how you want it.