I had the input challenges too, refreshing the game seemed to fix it. After dying and restarting the input didn't work.
I ran into a strange bug the first time I played, where on level 2, the recharge rate for my stamina got swapped, so my stamina charged really quickly and got used up really slowly. I think that felt more fair :stuck_out_tongue:
Both times I played, I got stuck on level 2 though -- there were no more birds left for me to rescue but I wasn't progressing. Didn't seem like there was anything I could do. I tried twice.
I found the powers a little hard to understand, seemed like I was constantly close to dying so I didn't feel I had much space to try things out.
Also, for the music, I found it the instruments a bit jarring, and the continuous beat is a little too repetitive I think. So my suggestion for next time would be to add maybe some chord progress or something to give the same a bit more structure / rhythm to be less repetitive
On the plus side, the bird graphics are nice! Good job with those!