Hi,
First of all thanks for playing!
Second you got some pretty spot-on feedback because I believe all the points you raised is something we came across and/or wanted to address but either forgot or didn't have time for. It would have definitely benefited from a success animation or sound, we noticed it felt weird that you couldn't drop "wrong" food except in the trash, and we wanted to put some sort of tutorial in too.
There is actually a "reward", which is points, but it's not clearly presented and since we messed up the timer (I believe it adds like 100 minutes every 4th level) you never see the end screen and thus your never see your scores! So yeah there's definitely some polish left to do. If we do pick it back up after the jam I also believe there's a few feature we still want to implement, so loads to do still.
Anyway, thanks so much for your feedback and for playing the game! I'm glad you enjoyed it so.