Finally got what the error is. It seems that your browser may not support the version of WebGL used to export this game. That, or it could be that this is the first game that was made with Unity that you tried to play from the browser, and your browser doesn't suport WebGL at all.
What hole? You mean the gap between the gate and the next zone? That is on purpose. What was not made on purpose is that when you stand on the borders of the roads, they don't work as floor. Don't ask me why.
Nice game! Would be cool if the game had a song in the main menu and the you win screen.
Also, something I personally don't like (don't worry, I won'w rate lower for this) is that with max attack, you take like 7-10 hits for the tanks. I think it should be reduced to something like 3-5.
Would love if you rated my game! It's a game where you have to form a crowd to destroy barriers. Also don't jump when you are walking on roads because they are bugged and they won't let you jump on the edges.
Nice graphics, art, sond effects, music, and gameplay!
It would be cool if you had some kind of button to make all the zombies go around the main one, because sometimes when a zombie gets stuck it won't be able to get back to the horde.
I just tested it and I see the problem: the road decorations don't act like floor, when they should. Try to jump from the grass instead and see if it works.
Follows the theme in a good way, the gameplay is nice, new mechanics are introduced really good, good music, good art. Overall, nice game!
Though I have found something that I don't like personally and that is that the cube is a bit slidy and in the last level it complicates it a bit more, but that's just me.
So you want to detect if both tags are colliding with a specific object?
If that is want you want, you could add a script to that specific object and add a OnCollisionEnter or OnTriggerEnter (2D or 3D, depending on what you want to do), and check for both tags.
I'd recommend creating two bools: one for a, and one for b, and then setting them on when they collide with the object.
Then in Update() add an if that checks if both bools are on, and then do what you want to do when those 2 objects collide with the specificobject.
Hope this helps!
EDIT: Also, OnTrigger is for colliders with "Is Trigger" on, and OnCollision is for coliders with "Is Trigger" off.
You have Enter, Stay, and Exit which I think are pretty self-explanatory, but just in case:
(the object = object that the script is attached to)
Enter: Used to detect when a object collides with the object.
Stay: Used to detect if an object is still collisioning with the object.
Exit: Used to detect when an object stops colliding with the object.
