Not only some but much problems with this movie, starting with:
1. Djjaner said that you used his sprites without his permission, no matter if you credited him.
2. You used my animated blowback animation... you're so bad that can't animate a simple blowback action?
3. Music didn't matched even 1% of the "movie".
4. The bullet lines, that was copied from someone (ZaracaM I guess), were totally wrong, its effect was horizontal, but it wasn't animated at exactly 90ยบ, and it got horrible.
5. Unoriginal name: Kenamii GIFTINATION? Again? Dang think on a name for it before start animating.
6. The character types (possessed agent and zombies) didn't affect their behaviour.
7. Kenamii shooted like 20 rounds on the beginning, but hit only 6 of them.
8. The zombie blood all over the floor was separated and looks like it has 2 trails.
9. When the guy from Time to Madness appeared, Kenamii waited until he points his revolver to him (reminds me of Dragon Ball Z somehow).
8. At 00:29, it's possible to see that Kenamii actually has 4 hands.
9. The revolver blowback was so big that it actually made the Time to Madness guy go backwards.
10. Who's dumb enough to die with Auditor's Halo powers?
11. Why the Time to Madness protagonist had Auditor's Halo???
12. The feet were a movie clip all the time (I saw your news post :3)
13. Kenamii's Sniper disappeared when he entered the last room.
14. No reason for Ellvis and your character be in a building with almost no one, and with only enemies.
15. no smoothness at any part of the movie.
The good is that at least you gave credit after using all of that. But, if you really want to make a gift movie to a friend, why use things you don't have permission to?