Thank you so much for the feedback, most of the bugs and glitches like objects having collider over the whole sprite breaking the 2.5D effect.
This was our first game we made and "fininshed" in unity, and we had trouble with the Z cordinations, because I messed up a lot of them while making the game.
Most of the time we spent on level building and it took us some time to make it.
The game is very easy thats true, we did not have a lot of time to make them, because we are still pretty slow.
All the other things you pointed out were true, so thank you once again for the feedback, we appreciate it. ^^