Yes, this is hack of "Gimmick!" (not "Mr.Gimmick!" which have poor sfx, it is the same game but on different cheaper mapper).
Gimmick! is not only one of the most beautiful games on NES/Famicom, with incredible soundtrack but also have excellent level design, physics, and many little details which game checking (i.e: //SPOILER when you kill 2nd boss, he drop his sword. Sword could stick into wood, could reflect from metal and fall to the sea. You can jump on it, destroy it, nail your star on blade etc. If you are really fast go to boss screen, he still... sleep and alarm clock wake him up, if you go to him ultra fast he will sleep much longer and you could drop him to the sea without fight - such things are on every level). This is why I love and recommend this game. Shame that Sunsoft never made a sequel.
No, they are original. I hope that I did not disappoint you. ;] Only what I done is level design and colour pallets modifications. In future I planing to add few more missing tiles, pallet swap for bottom hud, level select and eight level (I hope there's free space for it, didn't checked this yet).@Ness
And yes, I using smkdan's Gimmick Editor. Great piece of software.