Dude, you really nailed it. It's classic, but you did a great job. The difference in weapons, enemies, even a boss and an endless mode with upgrades is fantastic. The only thing I'd say you missed is the theme. Where does the Machine fit in? The weapons? The cubes? I'm not saying it looks bad, but I think you could have focused it more.
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Yeah I totally forgot about the theme at first but the core part was already done like the player movement and some enemies and after 3-4 days, I remembered there is a theme and I implemented it but you missed it! The texts at the bottom of every level, read them and you will understand what's happening and the last boss's name is "The Machine" and the text says destroy the machine and that's the end goal of the game. Its subtle but I could have done better like I just forgot about that! and thanks for your kind words dude!!! I will try to make the goal clearer after the jam and expand the game further until to an actual game release!!