Swinging boulders from Abe's Oddysee, Bats that fly in erratic (yet fair) patterns, Make it so that certain things aren't one hit KO's like if you implented the AO bees or something. Also if that screenshot is anything to go by, make some kind of UI even if it's just an LCD monitor hanging down at the top of the screen, as the score currently seems a bit out of place.
I'm afraid I can't be of much more assistance without actually being able to play the game.
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