Its very good.
but it need quite a bit of improvement to make it great.
You have clearly put in a lot of effort and it certainly has length. there are some nice touches including some little bits of huour and some bits and pieces of thought and story and some nice sounds.
However, its nearly all one long fight scen without any explanation or introduction. Who is this Spawnmaster? why is he running and jumping down the hole? You have to make this kind of story happen in order to make people CARE what happens to him. It is the quiet moments and the thoughts and the bright times which make the adventure seem exciting and important in contrast.
Also, having spent, I am sure, SO much time putting this good show together you really should have got someone who is good at English to read it through- someone who was NOT involved in the project who can see it objectively.
As for the credits, you need to put some into the notes right NOW, then edit the some of the boring, repetative action scenes a bit. All you need is one button on the end frame directing you to one single frame of static credits, for now at least. You may as well improve your interactivity by making a little menu at the end and including Scene Select, a one frame story background and a simple, one frame glimpse of the future in text- just a summary of how many episodes you plan, when you plan to have an alpha out of the next one etc.
For someone of your abilities, this is all very easy, surely?
Don't zoom in to a closeup of a pixelated sprite, it looks awful. Only zoom in if you are prepared to put in some detail to zoom into.
This story has SO much potential, take whatever time you need and ask for whatever help you need- its already so good you should get it.
Best Wishes,
IceDragon64 of the Dragons and Spirits