Nice implementation of the theme! One thing I recommend is some sort of enemy progression (maybe you already has this but I became invincible after approximately half the upgrades, so more health and speed to the enemies wouldn't hurt ). Also, I noticed a small bug; when buying upgrades, the trash count doesn't update until you close the upgrade screen. The game could also use some sound effects. Other than that, really great game and I hope you had fun making it. (I hope I don't sound too negative in this comment...)
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Thanks for playing and for the feedback!
I tried to make the enemies progressively stronger and harder to beat, but I couldn't manage to balance the game very well in the time I had. However, improving the game's difficulty and making it more fun is definitely on my list after the jam ends.
And yes I agree, the lack of sounds is a big disadvantage. I've postponed it too much and I couldn't add them in time.
And again, thank you for the feedback! I absolutely had a lot of fun making it and I learned a lot!