Thanks a lot for playing and thanks for this very informative feedback!
I am speechless and do not know what to say. It's simply very good and constructive feedback.
I'm happy that the experience of our game is actually almost exactly as we intended it to be, except sometimes a small bug occurs, but that's negotiable, haha.
About the hiding in a barrel mechanic: I feature creeped our game the last day and just added it because everybody said "please add it", but since the levels were already done and a very fast hiding mechanic would break most of the puzzles,
I applied a enter time window in which the player can get seen. Basically if you jump into your barrel and an enemy sees you, the enemy will remember you. That was part A to avoid breaking all the puzzles with a new mechanic.
Part B was an attempt to give the player some incentive of using it: You can't get seen as long as you do not stand in the way of your enemy. If the enemy walks against you regardless if you have been detected or not, you get caught. Either way, I added a small "act of patience" to the barrel mechanic. You get vision for a second every 2.5 seconds. The balancing of this mechanic was not very good, but I really wanted to implement all the animations of the duck, so everybody can enjoy the pixel art in its fullest.
We will definitely rework the hiding in a barrel mechanic to make it feel good and give it more meaning! :)
And of course, more variety to the player in terms of music and maybe even different kind of puzzles and environmental mechanics.
The ideas for this game are pretty open and I think we can go a little nuts with it.
Thanks again and thank you very much for playing our game :)