Dunno how you made the art for the game, but if you want to avoid having blurred sprites, avoid upscaling and stretching them in-game. If you're using a tool like Asesprite, you can usually upscale a texture when exporting. for example, in my game, we used 32x32 sprites that would be 400% bigger ingame, and we simply upscaled them during export to avoid the artifacts and the blur ingame.

The artstyle is cute, but the gameplay is kinda boring. I know you have multiple days, but I couldn't bother to finish even the first day, since there is no threat by the enemies and you gain cash too slowly. You can't expect people to be willing to play your game for hours just to unlock everything, especially for a game jam. I would make the progression a lot faster, so we can see all the content in under 30 minutes.

Anyway, well done on contributing to the game jam!

I can't seem to notice anything about Web Monetization API being implemented in the description, yet you selected this category - can you let me know if I'm missing anything?

I love the animation of the birds, it’s so cute. I wish I could get to the upgrades faster :)

It's a good game, try to improve the graphics. You can make enemies die faster, or give more money when you kill them. Clicking for half an hour on the screen for just one upgrade is annoying and can be improved, for example, by implementing a bonus that gives you x2 money if you buy it. It would be good if the enemies increase their speed and number of enemies, try to make the game more fun in that aspect of progression. If not otherwise, after two minutes playing you have already seen everything there is to do.