Really nice retro-feeling game. I don't have much to add that other's haven't written, but I'll place emphasis on the upgrades. I couldn't tell what they did. Cool kill for time mechanic. Nice cohesive look. It's fun.
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Thank you! I agree with a lot of people in the comments here that I probably should've put some indication as to what the upgrades did and will be putting a note in the description after the jam as I didn't manage to figure out a clean way to implement that into the game itself. Either way, I'm glad you enjoyed it.