Evolution Game by GBGames
This game is from the old Ludum Dare platform. You can try viewing the original page on Web Archive
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(may not load correctly).
While it doesn't have all of the features I wanted (multiple enemies with different weapon types, for instance), it should at least feel quite complete and self-explanatory.
The enemies get stronger as you go. While it is not how I originally intended, it's the evolution part of the game.
The enemies get stronger as you go. While it is not how I originally intended, it's the evolution part of the game.