Really solid game - especially for a first time game and first time game jam! Well done guys. Props to your artist too, super cute visuals.
I agree that the game can be punishing, but entirely get that that's the idea you were going for. :)
I don't know if it was just me - but the tutorial/readable at the start seemed to leave the screen kind of quickly without me clicking anything. If it is indeed timed (and not me realising I HAD pressed something!) It would be good to have a click to start motion, for those who are slower at reading or may get distracted between lauch and play.
I can see in comments you mentioned it being a tetris with food type idea, so bringing back the visuals and readables indicating this would really help players!
A little bit of scaleable difficulty would be great too. Just to allow players to ease in and get to grips with the mechanics before those pesky birds ramp up their attack! A handy tip is to get people who know nothing of your game or how to play to play test - really helps you learn balancing, as sometimes as devs you can be really good at your own game through practise and automatically knowing what you should do!
Overall, really enjoyable game and a great base to jump off of when you say you want to continue working on it!
Thanks for jamming with us guys, and congrats on the first game jam!