My initial idea is:

Zombies attacked your kingdom and infected all its inhabitants, you should defend your kingdom, heal the infected people and kill the enemy.

I still don't know if I could finish this within the time limit. If I didn't then I'll just submit the non-finished game to the jam anyways.

NEW UPDATE (not really a big one, unfortunately) :

I didn't plan the project before the beginning of the jam soo I created a little whiteboard in Milanote, I listed some "must-have" mechanics and ideas that I must add to the game, and some additional features that I could add if I had extra time.

I also downloaded some free-to-use assets from itch.io and modified some of them, rigged some of the characters, and I also did some level design.

By the way, I don't have much experience with creating 3d games, I'm more familiar with 2D games ... I did create one year ago a 3d game for the Brackeys game jam 2021.2  but it wasn't a good one. So I spend some time watching tutorials about how to create an enemy AI, import animations to unity, what's the difference between URP and HDRP etc ...

Honestly, I didn't accomplish much progress on these two first days, instead, I organised myself to achieve better results in the upcoming days.

BAD NEWS:

After learning how to create a NavMesh (an enemy AI), I added it to the game, with only one line of code I was able to make the zombies move to a specific coordinate.

After that I wanted to create a player controller, in the beginning, I thought a first-person controller could work for my game, but no. A third-person controller would be better because it allows the player to look behind him, soo he could see if zombies are attacking him from behind.

But a third-person controller is difficult to create, soo I decided to download one from the asset store, but all the assets I found are only compatible with version 2020 of Unity and I was using version 2019.4.

So I switched to version 2020 and I was surprised with 9 error messages in the console that are impossible to fix:

The errors were coming from the UnityEngine, not from my Scripts, so I started the project from the beginning, luckily I was able to copy-paste my files from the corrupted project, and the good thing is that "having this problem now means I won't have it later :)".

BIG UPDATE:

Yeah, I had some problems at the beginning of the jam but I finally did some serious progress:

Now, the player is completely able to move, and the zombies are able to find the shortest path to reach the player and they have a great walk animation.

I guess a video would demonstrate my progress better than some boring text so:

Next step: Shooting mechanic

EDIT: At the beginning of the jam I said that I'm not sure if I could finish the game within the time limit, but now I feel more confident, it's not that hard actually.

NEW UPDATE:

It's been 1 week since I posted anything on this subject but the development of the game is progressing very well.

Enemies can now be shot and killed, I made the zombies have multiple phases.

• Phase 1: Walking

• Phase 2: Running

• Phase 3: Crawling

And the zombies can also attack the player when in range, and they can deal damage to the player.

I have also created a desert level, and I plan to create 3 more levels and a tutorial before uploading the game.

I'll be uploading a demo video shortly after tweaking all these added features and polishing them.

Peace.

DEMO VIDEO:

The zombies can now attack and deal damage to the player. And they have 3 phases: Walking, running, and crawling.

DONE!

The game development of the game is totally done, the game has now zombies that attack you that you should kill by shooting at them, and they have 3 phases.

The game is also giving you the ability to heal infected people. And it also features a tutorial and 3 different levels.

I'll just fix some bugs and then submit the game.

Peace.

YOU CAN TEST IT:

You can now try the game yourself by downloading it from: https://hossamel2006.itch.io/apocazombies